64881432 has 256 divisors, whose sum is σ = 232243200. Its totient is φ = 16295040.

The previous prime is 64881431. The next prime is 64881437. The reversal of 64881432 is 23418846.

64881432 is a `hidden beast` number, since 648 + 8 + 1 + 4 + 3 + 2 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 (64881431) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 781663 + ... + 781745.

It is an arithmetic number, because the mean of its divisors is an integer number (907200).

Almost surely, 2^64881432 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 64881432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116121600).

64881432 is an abundant number, since it is smaller than the sum of its proper divisors (167361768).

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

64881432 is a wasteful number, since it uses less digits than its factorization.

64881432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 153 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 64881432 is about 8054.9011167115. The cubic root of 64881432 is about 401.8279504349.

It can be divided in two parts, 648814 and 32, that added together give a palindrome (648846).

The spelling of 64881432 in words is "sixty-four million, eight hundred eighty-one thousand, four hundred thirty-two".