78390508 has 12 divisors (see below), whose sum is σ = 156781072. Its totient is φ = 33595920.

The previous prime is 78390497. The next prime is 78390517. The reversal of 78390508 is 80509387.

78390508 is an admirable number.

It is a super-2 number, since 2×78390508² = 12290143488996128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399803 + ... + 1399858.

Almost surely, 2^78390508 is an apocalyptic number.

It is an amenable number.

78390508 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78390508 is a wasteful number, since it uses less digits than its factorization.

78390508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799672 (or 2799670 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 78390508 is about 8853.8414261833. The cubic root of 78390508 is about 427.9777188739.

The spelling of 78390508 in words is "seventy-eight million, three hundred ninety thousand, five hundred eight".