64557580 has 12 divisors (see below), whose sum is σ = 135570960. Its totient is φ = 25823024.

The previous prime is 64557553. The next prime is 64557589. The reversal of 64557580 is 8575546.

It is a super-2 number, since 2×64557580² = 8335362270912800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64557589) 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 3 ways as a sum of consecutive naturals, for example, 1613920 + ... + 1613959.

It is an arithmetic number, because the mean of its divisors is an integer number (11297580).

Almost surely, 2^64557580 is an apocalyptic number.

It is an amenable number.

64557580 is an abundant number, since it is smaller than the sum of its proper divisors (71013380).

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

64557580 is a wasteful number, since it uses less digits than its factorization.

64557580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227888 (or 3227886 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 64557580 is about 8034.7731766367. The cubic root of 64557580 is about 401.1582678019.

The spelling of 64557580 in words is "sixty-four million, five hundred fifty-seven thousand, five hundred eighty".