78091692 has 72 divisors (see below), whose sum is σ = 215651520. Its totient is φ = 21924000.

The previous prime is 78091667. The next prime is 78091709. The reversal of 78091692 is 29619087.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33567 + ... + 35817.

It is an arithmetic number, because the mean of its divisors is an integer number (2995160).

Almost surely, 2^78091692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78091692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107825760).

78091692 is an abundant number, since it is smaller than the sum of its proper divisors (137559828).

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

78091692 is a wasteful number, since it uses less digits than its factorization.

78091692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331 (or 2322 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 78091692 is about 8836.9503789486. The cubic root of 78091692 is about 427.4332250959.

The spelling of 78091692 in words is "seventy-eight million, ninety-one thousand, six hundred ninety-two".