657076421 has 4 divisors (see below), whose sum is σ = 672357312. Its totient is φ = 641795532.

The previous prime is 657076327. The next prime is 657076429. The reversal of 657076421 is 124670756.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 657076421 - 2²⁶ = 589967557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657076429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7640381 + ... + 7640466.

It is an arithmetic number, because the mean of its divisors is an integer number (168089328).

Almost surely, 2^657076421 is an apocalyptic number.

It is an amenable number.

657076421 is a deficient number, since it is larger than the sum of its proper divisors (15280891).

657076421 is a wasteful number, since it uses less digits than its factorization.

657076421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15280890.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 657076421 is about 25633.5019261903. The cubic root of 657076421 is about 869.3712906062.

The spelling of 657076421 in words is "six hundred fifty-seven million, seventy-six thousand, four hundred twenty-one".