978765408 has 36 divisors (see below), whose sum is σ = 2783364948. Its totient is φ = 326255040.

The previous prime is 978765379. The next prime is 978765419. The reversal of 978765408 is 804567879.

978765408 is a `hidden beast` number, since 97 + 8 + 7 + 6 + 540 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1698958 + ... + 1699533.

It is an arithmetic number, because the mean of its divisors is an integer number (77315693).

Almost surely, 2^978765408 is an apocalyptic number.

It is an amenable number.

978765408 is an abundant number, since it is smaller than the sum of its proper divisors (1804599540).

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

978765408 is a wasteful number, since it uses less digits than its factorization.

978765408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398507 (or 3398496 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The square root of 978765408 is about 31285.2266733038. The cubic root of 978765408 is about 992.8711022499.

The spelling of 978765408 in words is "nine hundred seventy-eight million, seven hundred sixty-five thousand, four hundred eight".