64996512 has 72 divisors (see below), whose sum is σ = 195618528. Its totient is φ = 18510720.

The previous prime is 64996501. The next prime is 64996513. The reversal of 64996512 is 21569946.

It is a happy number.

It is a super-2 number, since 2×64996512² = 8449093144332288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (64996513) 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, 208837 + ... + 209147.

It is an arithmetic number, because the mean of its divisors is an integer number (2716924).

Almost surely, 2^64996512 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 64996512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97809264).

64996512 is an abundant number, since it is smaller than the sum of its proper divisors (130622016).

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

64996512 is an equidigital number, since it uses as much as digits as its factorization.

64996512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 323 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 64996512 is about 8062.0414288194. The cubic root of 64996512 is about 402.0653837859.

Multiplying 64996512 by its sum of digits (42), we get a square (2729853504 = 52248²).

64996512 divided by its sum of digits (42) gives a square (1547536 = 1244²).

The spelling of 64996512 in words is "sixty-four million, nine hundred ninety-six thousand, five hundred twelve".