657540420 has 96 divisors (see below), whose sum is σ = 1866848256. Its totient is φ = 172915200.

The previous prime is 657540413. The next prime is 657540421. The reversal of 657540420 is 24045756.

It is not an unprimeable number, because it can be changed into a prime (657540421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2074102 + ... + 2074418.

It is an arithmetic number, because the mean of its divisors is an integer number (19446336).

Almost surely, 2^657540420 is an apocalyptic number.

657540420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

657540420 is an abundant number, since it is smaller than the sum of its proper divisors (1209307836).

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

657540420 is a wasteful number, since it uses less digits than its factorization.

657540420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 657540420 is about 25642.5509651439. The cubic root of 657540420 is about 869.5758799468.

The spelling of 657540420 in words is "six hundred fifty-seven million, five hundred forty thousand, four hundred twenty".