64831976 has 32 divisors (see below), whose sum is σ = 133678080. Its totient is φ = 29232000.

The previous prime is 64831969. The next prime is 64831979. The reversal of 64831976 is 67913846.

It is a super-2 number, since 2×64831976² = 8406370224129152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (64831979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8276 + ... + 14076.

It is an arithmetic number, because the mean of its divisors is an integer number (4177440).

Almost surely, 2^64831976 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 64831976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66839040).

64831976 is an abundant number, since it is smaller than the sum of its proper divisors (68846104).

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

64831976 is a wasteful number, since it uses less digits than its factorization.

64831976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5945 (or 5941 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 64831976 is about 8051.8305993109. The cubic root of 64831976 is about 401.7258264321.

The spelling of 64831976 in words is "sixty-four million, eight hundred thirty-one thousand, nine hundred seventy-six".