662978138 has 12 divisors (see below), whose sum is σ = 1056407262. Its totient is φ = 311989440.

The previous prime is 662978131. The next prime is 662978149. The reversal of 662978138 is 831879266.

662978138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 656743129 + 6235009 = 25627^2 + 2497^2 .

It is a super-2 number, since 2×662978138² = 879080022931894088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (662978131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572933 + ... + 574088.

Almost surely, 2^662978138 is an apocalyptic number.

662978138 is a deficient number, since it is larger than the sum of its proper divisors (393429124).

662978138 is a wasteful number, since it uses less digits than its factorization.

662978138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147057 (or 1147040 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 662978138 is about 25748.3618508052. The cubic root of 662978138 is about 871.9663709571.

The spelling of 662978138 in words is "six hundred sixty-two million, nine hundred seventy-eight thousand, one hundred thirty-eight".