78836531 has 8 divisors (see below), whose sum is σ = 85250880. Its totient is φ = 72619648.

The previous prime is 78836519. The next prime is 78836533. The reversal of 78836531 is 13563887.

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

It is a de Polignac number, because none of the positive numbers 2^k-78836531 is a prime.

It is a super-2 number, since 2×78836531² = 12430397240227922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78836533) 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, 48536 + ... + 50133.

It is an arithmetic number, because the mean of its divisors is an integer number (10656360).

Almost surely, 2^78836531 is an apocalyptic number.

78836531 is a deficient number, since it is larger than the sum of its proper divisors (6414349).

78836531 is a wasteful number, since it uses less digits than its factorization.

78836531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98733.

The product of its digits is 120960, while the sum is 41.

The square root of 78836531 is about 8878.9938056066. The cubic root of 78836531 is about 428.7878807830.

The spelling of 78836531 in words is "seventy-eight million, eight hundred thirty-six thousand, five hundred thirty-one".