64936440 has 48 divisors (see below), whose sum is σ = 211044600. Its totient is φ = 17316288.

The previous prime is 64936439. The next prime is 64936463. The reversal of 64936440 is 4463946.

64936440 is a `hidden beast` number, since 6 + 4 + 9 + 3 + 644 + 0 = 666.

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 = 64936395 and 64936404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89830 + ... + 90549.

Almost surely, 2^64936440 is an apocalyptic number.

64936440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64936440 is an abundant number, since it is smaller than the sum of its proper divisors (146108160).

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

64936440 is a wasteful number, since it uses less digits than its factorization.

64936440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180396 (or 180389 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 64936440 is about 8058.3149603376. The cubic root of 64936440 is about 401.9414780778.

The spelling of 64936440 in words is "sixty-four million, nine hundred thirty-six thousand, four hundred forty".