64140288 has 44 divisors (see below), whose sum is σ = 170965440. Its totient is φ = 21379072.

The previous prime is 64140233. The next prime is 64140301. The reversal of 64140288 is 88204146.

It is a super-2 number, since 2×64140288² = 8227953089445888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7368 + ... + 13511.

Almost surely, 2^64140288 is an apocalyptic number.

It is an amenable number.

64140288 is an abundant number, since it is smaller than the sum of its proper divisors (106825152).

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

64140288 is a wasteful number, since it uses less digits than its factorization.

64140288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20902 (or 20884 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 64140288 is about 8008.7632003949. The cubic root of 64140288 is about 400.2920533768.

The spelling of 64140288 in words is "sixty-four million, one hundred forty thousand, two hundred eighty-eight".