78142292 has 12 divisors (see below), whose sum is σ = 136842720. Its totient is φ = 39044376.

The previous prime is 78142279. The next prime is 78142321. The reversal of 78142292 is 29224187.

It is a super-2 number, since 2×78142292² = 12212435598026528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809 + ... + 12527.

It is an arithmetic number, because the mean of its divisors is an integer number (11403560).

Almost surely, 2^78142292 is an apocalyptic number.

It is an amenable number.

78142292 is a deficient number, since it is larger than the sum of its proper divisors (58700428).

78142292 is a wasteful number, since it uses less digits than its factorization.

78142292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13390 (or 13388 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 78142292 is about 8839.8128939475. The cubic root of 78142292 is about 427.5255245068.

The spelling of 78142292 in words is "seventy-eight million, one hundred forty-two thousand, two hundred ninety-two".