625978 has 4 divisors (see below), whose sum is σ = 938970. Its totient is φ = 312988.

The previous prime is 625969. The next prime is 625979. The reversal of 625978 is 879526.

625978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879526 = 2 ⋅439763.

It can be written as a sum of positive squares in only one way, i.e., 494209 + 131769 = 703^2 + 363^2 .

It is not an unprimeable number, because it can be changed into a prime (625979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156493 + ... + 156496.

2⁶²⁵⁹⁷⁸ is an apocalyptic number.

625978 is a deficient number, since it is larger than the sum of its proper divisors (312992).

625978 is a wasteful number, since it uses less digits than its factorization.

625978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312991.

The product of its digits is 30240, while the sum is 37.

The square root of 625978 is about 791.1877147681. The cubic root of 625978 is about 85.5433702654.

The spelling of 625978 in words is "six hundred twenty-five thousand, nine hundred seventy-eight".