64391080 has 32 divisors (see below), whose sum is σ = 156025800. Its totient is φ = 23774976.

The previous prime is 64391077. The next prime is 64391111. The reversal of 64391080 is 8019346.

It can be written as a sum of positive squares in 4 ways, for example, as 41139396 + 23251684 = 6414^2 + 4822^2 .

It is a super-2 number, since 2×64391080² = 8292422367132800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61395 + ... + 62434.

Almost surely, 2^64391080 is an apocalyptic number.

It is an amenable number.

64391080 is an abundant number, since it is smaller than the sum of its proper divisors (91634720).

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

64391080 is a wasteful number, since it uses less digits than its factorization.

64391080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123853 (or 123849 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 64391080 is about 8024.4052739128. The cubic root of 64391080 is about 400.8130960671.

The spelling of 64391080 in words is "sixty-four million, three hundred ninety-one thousand, eighty".