78071531 has 8 divisors (see below), whose sum is σ = 84587184. Its totient is φ = 71769600.

The previous prime is 78071527. The next prime is 78071537. The reversal of 78071531 is 13517087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78071531 - 2² = 78071527 is a prime.

It is a super-2 number, since 2×78071531² = 12190327905367922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78071537) 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, 52670 + ... + 54131.

It is an arithmetic number, because the mean of its divisors is an integer number (10573398).

Almost surely, 2^78071531 is an apocalyptic number.

78071531 is a deficient number, since it is larger than the sum of its proper divisors (6515653).

78071531 is a wasteful number, since it uses less digits than its factorization.

78071531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106861.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 78071531 is about 8835.8095837337. The cubic root of 78071531 is about 427.3964383275.

The spelling of 78071531 in words is "seventy-eight million, seventy-one thousand, five hundred thirty-one".