78091311 has 32 divisors (see below), whose sum is σ = 113428480. Its totient is φ = 47628000.

The previous prime is 78091301. The next prime is 78091331. The reversal of 78091311 is 11319087.

It is not a de Polignac number, because 78091311 - 2¹³ = 78083119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78091301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 369996 + ... + 370206.

It is an arithmetic number, because the mean of its divisors is an integer number (3544640).

Almost surely, 2^78091311 is an apocalyptic number.

78091311 is a deficient number, since it is larger than the sum of its proper divisors (35337169).

78091311 is a wasteful number, since it uses less digits than its factorization.

78091311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 78091311 is about 8836.9288217118. The cubic root of 78091311 is about 427.4325299629.

The spelling of 78091311 in words is "seventy-eight million, ninety-one thousand, three hundred eleven".