78694408 has 64 divisors (see below), whose sum is σ = 167650560. Its totient is φ = 34358016.

The previous prime is 78694393. The next prime is 78694417. The reversal of 78694408 is 80449687.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399366 + ... + 399562.

It is an arithmetic number, because the mean of its divisors is an integer number (2619540).

Almost surely, 2^78694408 is an apocalyptic number.

78694408 is the 5122-nd octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78694408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83825280).

78694408 is an abundant number, since it is smaller than the sum of its proper divisors (88956152).

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

78694408 is a wasteful number, since it uses less digits than its factorization.

78694408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 78694408 is about 8870.9868673108. The cubic root of 78694408 is about 428.5300592026.

The spelling of 78694408 in words is "seventy-eight million, six hundred ninety-four thousand, four hundred eight".