913808978 has 4 divisors (see below), whose sum is σ = 1370713470. Its totient is φ = 456904488.

The previous prime is 913808969. The next prime is 913808983. The reversal of 913808978 is 879808319.

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

It can be written as a sum of positive squares in only one way, i.e., 766016329 + 147792649 = 27677^2 + 12157^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 228452243 + ... + 228452246.

Almost surely, 2^913808978 is an apocalyptic number.

913808978 is a deficient number, since it is larger than the sum of its proper divisors (456904492).

913808978 is a wasteful number, since it uses less digits than its factorization.

913808978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456904491.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 913808978 is about 30229.2735274932. The cubic root of 913808978 is about 970.4022769048.

The spelling of 913808978 in words is "nine hundred thirteen million, eight hundred eight thousand, nine hundred seventy-eight".