78290261055 has 24 divisors (see below), whose sum is σ = 136266221520. Its totient is φ = 41581543680.

The previous prime is 78290261047. The next prime is 78290261069. The reversal of 78290261055 is 55016209287.

78290261055 is a `hidden beast` number, since 7 + 8 + 29 + 0 + 2 + 610 + 5 + 5 = 666.

It is not a de Polignac number, because 78290261055 - 2³ = 78290261047 is a prime.

It is a super-2 number, since 2×78290261055² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78290261055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3598665 + ... + 3620354.

It is an arithmetic number, because the mean of its divisors is an integer number (5677759230).

Almost surely, 2^78290261055 is an apocalyptic number.

78290261055 is a deficient number, since it is larger than the sum of its proper divisors (57975960465).

78290261055 is a wasteful number, since it uses less digits than its factorization.

78290261055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7219271 (or 7219268 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 78290261055 in words is "seventy-eight billion, two hundred ninety million, two hundred sixty-one thousand, fifty-five".