78155892 has 72 divisors (see below), whose sum is σ = 209532960. Its totient is φ = 24494400.

The previous prime is 78155839. The next prime is 78155893. The reversal of 78155892 is 29855187.

It is a happy number.

78155892 is a `hidden beast` number, since 7 + 8 + 1 + 558 + 92 = 666.

It is a super-2 number, since 2×78155892² = 12216686908631328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78155893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111142 + ... + 111842.

It is an arithmetic number, because the mean of its divisors is an integer number (2910180).

Almost surely, 2^78155892 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 78155892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104766480).

78155892 is an abundant number, since it is smaller than the sum of its proper divisors (131377068).

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

78155892 is a wasteful number, since it uses less digits than its factorization.

78155892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 888 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 78155892 is about 8840.5821075312. The cubic root of 78155892 is about 427.5503254595.

The spelling of 78155892 in words is "seventy-eight million, one hundred fifty-five thousand, eight hundred ninety-two".