65557420 has 24 divisors (see below), whose sum is σ = 137824848. Its totient is φ = 26193600.

The previous prime is 65557417. The next prime is 65557477. The reversal of 65557420 is 2475556.

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, 29550 + ... + 31690.

It is an arithmetic number, because the mean of its divisors is an integer number (5742702).

Almost surely, 2^65557420 is an apocalyptic number.

It is an amenable number.

65557420 is an abundant number, since it is smaller than the sum of its proper divisors (72267428).

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

65557420 is a wasteful number, since it uses less digits than its factorization.

65557420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681 (or 3679 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 65557420 is about 8096.7536704534. The cubic root of 65557420 is about 403.2186561636.

The spelling of 65557420 in words is "sixty-five million, five hundred fifty-seven thousand, four hundred twenty".