64933440 has 336 divisors, whose sum is σ = 249716544. Its totient is φ = 14192640.

The previous prime is 64933417. The next prime is 64933447. The reversal of 64933440 is 4433946.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64933447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1510059 + ... + 1510101.

It is an arithmetic number, because the mean of its divisors is an integer number (743204).

Almost surely, 2^64933440 is an apocalyptic number.

64933440 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 64933440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124858272).

64933440 is an abundant number, since it is smaller than the sum of its proper divisors (184783104).

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

64933440 is a wasteful number, since it uses less digits than its factorization.

64933440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 64933440 is about 8058.1288150538. The cubic root of 64933440 is about 401.9352882148.

The spelling of 64933440 in words is "sixty-four million, nine hundred thirty-three thousand, four hundred forty".