78121092 has 36 divisors (see below), whose sum is σ = 212044560. Its totient is φ = 22320144.

The previous prime is 78121079. The next prime is 78121093. The reversal of 78121092 is 29012187.

It is a super-2 number, since 2×78121092² = 12205810030544928, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78121093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65842 + ... + 67017.

Almost surely, 2^78121092 is an apocalyptic number.

It is an amenable number.

78121092 is an abundant number, since it is smaller than the sum of its proper divisors (133923468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78121092 is a wasteful number, since it uses less digits than its factorization.

78121092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132880 (or 132871 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 78121092 is about 8838.6136922031. The cubic root of 78121092 is about 427.4868584586.

The spelling of 78121092 in words is "seventy-eight million, one hundred twenty-one thousand, ninety-two".