64255840 has 72 divisors (see below), whose sum is σ = 166909680. Its totient is φ = 23358720.

The previous prime is 64255837. The next prime is 64255843. The reversal of 64255840 is 4855246.

It is an interprime number because it is at equal distance from previous prime (64255837) and next prime (64255843).

It is a junction number, because it is equal to n+sod(n) for n = 64255796 and 64255805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64255843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17701 + ... + 21019.

It is an arithmetic number, because the mean of its divisors is an integer number (2318190).

Almost surely, 2^64255840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64255840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83454840).

64255840 is an abundant number, since it is smaller than the sum of its proper divisors (102653840).

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

64255840 is a wasteful number, since it uses less digits than its factorization.

64255840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356 (or 3337 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 64255840 is about 8015.9740518542. The cubic root of 64255840 is about 400.5322913506.

The spelling of 64255840 in words is "sixty-four million, two hundred fifty-five thousand, eight hundred forty".