78931811 has 8 divisors (see below), whose sum is σ = 90265440. Its totient is φ = 67612608.

The previous prime is 78931807. The next prime is 78931817. The reversal of 78931811 is 11813987.

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

It is not a de Polignac number, because 78931811 - 2² = 78931807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78931817) 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, 13625 + ... + 18533.

It is an arithmetic number, because the mean of its divisors is an integer number (11283180).

Almost surely, 2^78931811 is an apocalyptic number.

78931811 is a deficient number, since it is larger than the sum of its proper divisors (11333629).

78931811 is a wasteful number, since it uses less digits than its factorization.

78931811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213.

The product of its digits is 12096, while the sum is 38.

The square root of 78931811 is about 8884.3576582666. The cubic root of 78931811 is about 428.9605522634.

The spelling of 78931811 in words is "seventy-eight million, nine hundred thirty-one thousand, eight hundred eleven".