64912874040 has 256 divisors, whose sum is σ = 247611340800. Its totient is φ = 14817779712.

The previous prime is 64912874029. The next prime is 64912874051. The reversal of 64912874040 is 4047821946.

64912874040 is a `hidden beast` number, since 6 + 491 + 2 + 87 + 40 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (64912874029) and next prime (64912874051).

It is a super-2 number, since 2×64912874040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6216664 + ... + 6227096.

It is an arithmetic number, because the mean of its divisors is an integer number (967231800).

Almost surely, 2^64912874040 is an apocalyptic number.

64912874040 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 64912874040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123805670400).

64912874040 is an abundant number, since it is smaller than the sum of its proper divisors (182698466760).

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

64912874040 is a wasteful number, since it uses less digits than its factorization.

64912874040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11283 (or 11273 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 64912874040 in words is "sixty-four billion, nine hundred twelve million, eight hundred seventy-four thousand, forty".