715978 has 4 divisors (see below), whose sum is σ = 1073970. Its totient is φ = 357988.

The previous prime is 715973. The next prime is 715991. The reversal of 715978 is 879517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879517 = 103 ⋅8539.

It can be written as a sum of positive squares in only one way, i.e., 710649 + 5329 = 843^2 + 73^2 .

It is not an unprimeable number, because it can be changed into a prime (715973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178993 + ... + 178996.

2⁷¹⁵⁹⁷⁸ is an apocalyptic number.

715978 is a deficient number, since it is larger than the sum of its proper divisors (357992).

715978 is a wasteful number, since it uses less digits than its factorization.

715978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357991.

The product of its digits is 17640, while the sum is 37.

The square root of 715978 is about 846.1548321673. The cubic root of 715978 is about 89.4608923739.

The spelling of 715978 in words is "seven hundred fifteen thousand, nine hundred seventy-eight".