657567420 has 24 divisors (see below), whose sum is σ = 1841188944. Its totient is φ = 175351296.

The previous prime is 657567397. The next prime is 657567457. The reversal of 657567420 is 24765756.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5479669 + ... + 5479788.

It is an arithmetic number, because the mean of its divisors is an integer number (76716206).

Almost surely, 2^657567420 is an apocalyptic number.

657567420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

657567420 is an abundant number, since it is smaller than the sum of its proper divisors (1183621524).

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

657567420 is a wasteful number, since it uses less digits than its factorization.

657567420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10959469 (or 10959467 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 42.

The square root of 657567420 is about 25643.0774284211. The cubic root of 657567420 is about 869.5877819920.

The spelling of 657567420 in words is "six hundred fifty-seven million, five hundred sixty-seven thousand, four hundred twenty".