64999872 has 210 divisors, whose sum is σ = 221973648. Its totient is φ = 18176256.

The previous prime is 64999871. The next prime is 64999877. The reversal of 64999872 is 27899946.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64999871) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1382953 + ... + 1382999.

Almost surely, 2^64999872 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 64999872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110986824).

64999872 is an abundant number, since it is smaller than the sum of its proper divisors (156973776).

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

64999872 is an equidigital number, since it uses as much as digits as its factorization.

64999872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 59 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 64999872 is about 8062.2498100716. The cubic root of 64999872 is about 402.0723119342.

The spelling of 64999872 in words is "sixty-four million, nine hundred ninety-nine thousand, eight hundred seventy-two".