78400308811 has 16 divisors (see below), whose sum is σ = 86121750528. Its totient is φ = 70779164800.

The previous prime is 78400308803. The next prime is 78400308823. The reversal of 78400308811 is 11880300487.

It is a cyclic number.

It is not a de Polignac number, because 78400308811 - 2³ = 78400308803 is a prime.

It is a super-2 number, since 2×78400308811² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78400308211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1214430 + ... + 1277356.

It is an arithmetic number, because the mean of its divisors is an integer number (5382609408).

Almost surely, 2^78400308811 is an apocalyptic number.

78400308811 is a deficient number, since it is larger than the sum of its proper divisors (7721441717).

78400308811 is a wasteful number, since it uses less digits than its factorization.

78400308811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63722.

The product of its (nonzero) digits is 43008, while the sum is 40.

The spelling of 78400308811 in words is "seventy-eight billion, four hundred million, three hundred eight thousand, eight hundred eleven".