78837575406 has 64 divisors (see below), whose sum is σ = 170204198400. Its totient is φ = 24269414400.

The previous prime is 78837575389. The next prime is 78837575423. The reversal of 78837575406 is 60457573887.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78837575389) and next prime (78837575423).

It is a self number, because there is not a number n which added to its sum of digits gives 78837575406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 665646 + ... + 775086.

It is an arithmetic number, because the mean of its divisors is an integer number (2659440600).

Almost surely, 2^78837575406 is an apocalyptic number.

78837575406 is an abundant number, since it is smaller than the sum of its proper divisors (91366622994).

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

78837575406 is a wasteful number, since it uses less digits than its factorization.

78837575406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109625.

The product of its (nonzero) digits is 39513600, while the sum is 60.

The spelling of 78837575406 in words is "seventy-eight billion, eight hundred thirty-seven million, five hundred seventy-five thousand, four hundred six".