657440422 has 16 divisors (see below), whose sum is σ = 1061871120. Its totient is φ = 304139008.

The previous prime is 657440389. The next prime is 657440429. The reversal of 657440422 is 224044756.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657440429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161863 + ... + 165874.

It is an arithmetic number, because the mean of its divisors is an integer number (66366945).

Almost surely, 2^657440422 is an apocalyptic number.

657440422 is a deficient number, since it is larger than the sum of its proper divisors (404430698).

657440422 is a wasteful number, since it uses less digits than its factorization.

657440422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327815.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 657440422 is about 25640.6010459973. The cubic root of 657440422 is about 869.5317963414.

The spelling of 657440422 in words is "six hundred fifty-seven million, four hundred forty thousand, four hundred twenty-two".