78142031 has 4 divisors (see below), whose sum is σ = 85245864. Its totient is φ = 71038200.

The previous prime is 78142021. The next prime is 78142049. The reversal of 78142031 is 13024187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78142031 - 2⁶ = 78141967 is a prime.

It is a super-2 number, since 2×78142031² = 12212354017609922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78142021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551900 + ... + 3551921.

It is an arithmetic number, because the mean of its divisors is an integer number (21311466).

Almost surely, 2^78142031 is an apocalyptic number.

78142031 is a deficient number, since it is larger than the sum of its proper divisors (7103833).

78142031 is a wasteful number, since it uses less digits than its factorization.

78142031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7103832.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 78142031 is about 8839.7981311792. The cubic root of 78142031 is about 427.5250485192.

The spelling of 78142031 in words is "seventy-eight million, one hundred forty-two thousand, thirty-one".