78741531 has 16 divisors (see below), whose sum is σ = 127259520. Its totient is φ = 47721960.

The previous prime is 78741527. The next prime is 78741541. The reversal of 78741531 is 13514787.

78741531 is a `hidden beast` number, since 7 + 87 + 41 + 531 = 666.

It is not a de Polignac number, because 78741531 - 2² = 78741527 is a prime.

It is a super-2 number, since 2×78741531² = 12400457408447922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78741511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132265 + ... + 132858.

It is an arithmetic number, because the mean of its divisors is an integer number (7953720).

Almost surely, 2^78741531 is an apocalyptic number.

78741531 is a deficient number, since it is larger than the sum of its proper divisors (48517989).

78741531 is a wasteful number, since it uses less digits than its factorization.

78741531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265143 (or 265137 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 78741531 is about 8873.6424877273. The cubic root of 78741531 is about 428.6155781660.

The spelling of 78741531 in words is "seventy-eight million, seven hundred forty-one thousand, five hundred thirty-one".