64697880 has 128 divisors (see below), whose sum is σ = 212486400. Its totient is φ = 15662592.

The previous prime is 64697879. The next prime is 64697891. The reversal of 64697880 is 8879646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104211 + ... + 104829.

It is an arithmetic number, because the mean of its divisors is an integer number (1660050).

Almost surely, 2^64697880 is an apocalyptic number.

64697880 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 64697880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106243200).

64697880 is an abundant number, since it is smaller than the sum of its proper divisors (147788520).

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

64697880 is a wasteful number, since it uses less digits than its factorization.

64697880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 64697880 is about 8043.4992385155. The cubic root of 64697880 is about 401.4486637661.

The spelling of 64697880 in words is "sixty-four million, six hundred ninety-seven thousand, eight hundred eighty".