78078534 has 16 divisors (see below), whose sum is σ = 156334320. Its totient is φ = 25996640.

The previous prime is 78078503. The next prime is 78078541. The reversal of 78078534 is 43587087.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1269 + ... + 12560.

It is an arithmetic number, because the mean of its divisors is an integer number (9770895).

Almost surely, 2^78078534 is an apocalyptic number.

78078534 is an abundant number, since it is smaller than the sum of its proper divisors (78255786).

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

78078534 is a wasteful number, since it uses less digits than its factorization.

78078534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14775.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 78078534 is about 8836.2058599831. The cubic root of 78078534 is about 427.4092170691.

The spelling of 78078534 in words is "seventy-eight million, seventy-eight thousand, five hundred thirty-four".