64163988 has 120 divisors (see below), whose sum is σ = 201924800. Its totient is φ = 17356032.

The previous prime is 64163971. The next prime is 64163989. The reversal of 64163988 is 88936146.

64163988 is a `hidden beast` number, since 6 + 4 + 1 + 639 + 8 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64163989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42348 + ... + 43836.

Almost surely, 2^64163988 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 64163988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100962400).

64163988 is an abundant number, since it is smaller than the sum of its proper divisors (137760812).

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

64163988 is a wasteful number, since it uses less digits than its factorization.

64163988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531 (or 1520 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 64163988 is about 8010.2426929526. The cubic root of 64163988 is about 400.3413502838.

It can be divided in two parts, 6416 and 3988, that added together give a square (10404 = 102²).

The spelling of 64163988 in words is "sixty-four million, one hundred sixty-three thousand, nine hundred eighty-eight".