662978 has 4 divisors (see below), whose sum is σ = 994470. Its totient is φ = 331488.

The previous prime is 662957. The next prime is 662999. The reversal of 662978 is 879266.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (662957) and next prime (662999).

It can be written as a sum of positive squares in only one way, i.e., 444889 + 218089 = 667^2 + 467^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165743 + ... + 165746.

2⁶⁶²⁹⁷⁸ is an apocalyptic number.

662978 is a deficient number, since it is larger than the sum of its proper divisors (331492).

662978 is a wasteful number, since it uses less digits than its factorization.

662978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331491.

The product of its digits is 36288, while the sum is 38.

The square root of 662978 is about 814.2346099252. The cubic root of 662978 is about 87.1966310457.

The spelling of 662978 in words is "six hundred sixty-two thousand, nine hundred seventy-eight".