64155880 has 16 divisors (see below), whose sum is σ = 144350820. Its totient is φ = 25662336.

The previous prime is 64155853. The next prime is 64155881. The reversal of 64155880 is 8855146.

It can be written as a sum of positive squares in 2 ways, for example, as 63712324 + 443556 = 7982^2 + 666^2 .

It is not an unprimeable number, because it can be changed into a prime (64155881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801909 + ... + 801988.

Almost surely, 2^64155880 is an apocalyptic number.

It is an amenable number.

64155880 is an abundant number, since it is smaller than the sum of its proper divisors (80194940).

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

64155880 is a wasteful number, since it uses less digits than its factorization.

64155880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603908 (or 1603904 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 64155880 is about 8009.7365749443. The cubic root of 64155880 is about 400.3244866998.

The spelling of 64155880 in words is "sixty-four million, one hundred fifty-five thousand, eight hundred eighty".