662387978 has 12 divisors (see below), whose sum is σ = 1155799602. Its totient is φ = 283880520.

The previous prime is 662387951. The next prime is 662387981. The reversal of 662387978 is 879783266.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 563445169 + 98942809 = 23737^2 + 9947^2 .

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 5 ways as a sum of consecutive naturals, for example, 3379433 + ... + 3379628.

Almost surely, 2^662387978 is an apocalyptic number.

662387978 is a deficient number, since it is larger than the sum of its proper divisors (493411624).

662387978 is a wasteful number, since it uses less digits than its factorization.

662387978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759077 (or 6759070 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 56.

The square root of 662387978 is about 25736.8991527729. The cubic root of 662387978 is about 871.7075628042.

The spelling of 662387978 in words is "six hundred sixty-two million, three hundred eighty-seven thousand, nine hundred seventy-eight".