64697040 has 120 divisors (see below), whose sum is σ = 221101920. Its totient is φ = 16948992.

The previous prime is 64697023. The next prime is 64697041. The reversal of 64697040 is 4079646.

64697040 is a `hidden beast` number, since 646 + 9 + 7 + 0 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64696986 and 64697004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64697041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41719 + ... + 43241.

It is an arithmetic number, because the mean of its divisors is an integer number (1842516).

Almost surely, 2^64697040 is an apocalyptic number.

64697040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64697040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110550960).

64697040 is an abundant number, since it is smaller than the sum of its proper divisors (156404880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64697040 is a wasteful number, since it uses less digits than its factorization.

64697040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1592 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 64697040 is about 8043.4470222660. The cubic root of 64697040 is about 401.4469263659.

The spelling of 64697040 in words is "sixty-four million, six hundred ninety-seven thousand, forty".