64881264 has 80 divisors (see below), whose sum is σ = 197765120. Its totient is φ = 17936640.

The previous prime is 64881251. The next prime is 64881277. The reversal of 64881264 is 46218846.

It is an interprime number because it is at equal distance from previous prime (64881251) and next prime (64881277).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7302 + ... + 13530.

It is an arithmetic number, because the mean of its divisors is an integer number (2472064).

Almost surely, 2^64881264 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 64881264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98882560).

64881264 is an abundant number, since it is smaller than the sum of its proper divisors (132883856).

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

64881264 is a wasteful number, since it uses less digits than its factorization.

64881264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6278 (or 6272 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 64881264 is about 8054.8906882713. The cubic root of 64881264 is about 401.8276036117.

The spelling of 64881264 in words is "sixty-four million, eight hundred eighty-one thousand, two hundred sixty-four".