78131494 has 16 divisors (see below), whose sum is σ = 137560608. Its totient is φ = 32579712.

The previous prime is 78131491. The next prime is 78131509. The reversal of 78131494 is 49413187.

It is a super-2 number, since 2×78131494² = 12209060709344072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78131491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74899 + ... + 75934.

It is an arithmetic number, because the mean of its divisors is an integer number (8597538).

Almost surely, 2^78131494 is an apocalyptic number.

78131494 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

78131494 is a deficient number, since it is larger than the sum of its proper divisors (59429114).

78131494 is a wasteful number, since it uses less digits than its factorization.

78131494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150879.

The product of its digits is 24192, while the sum is 37.

The square root of 78131494 is about 8839.2021133132. The cubic root of 78131494 is about 427.5058312304.

The spelling of 78131494 in words is "seventy-eight million, one hundred thirty-one thousand, four hundred ninety-four".