78985831 has 8 divisors (see below), whose sum is σ = 84385280. Its totient is φ = 73710648.

The previous prime is 78985817. The next prime is 78985889. The reversal of 78985831 is 13858987.

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 78985831 - 2¹¹ = 78983783 is a prime.

It is a super-2 number, since 2×78985831² = 12477522997521122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78985801) 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, 29751 + ... + 32296.

It is an arithmetic number, because the mean of its divisors is an integer number (10548160).

Almost surely, 2^78985831 is an apocalyptic number.

78985831 is a deficient number, since it is larger than the sum of its proper divisors (5399449).

78985831 is a wasteful number, since it uses less digits than its factorization.

78985831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62133.

The product of its digits is 483840, while the sum is 49.

The square root of 78985831 is about 8887.3973130495. The cubic root of 78985831 is about 429.0583884608.

The spelling of 78985831 in words is "seventy-eight million, nine hundred eighty-five thousand, eight hundred thirty-one".