78290444655 has 24 divisors (see below), whose sum is σ = 135714327840. Its totient is φ = 41751552960.

The previous prime is 78290444597. The next prime is 78290444677. The reversal of 78290444655 is 55644409287.

It is not a de Polignac number, because 78290444655 - 2⁷ = 78290444527 is a prime.

It is a super-2 number, since 2×78290444655² (a number of 23 digits) contains 22 as substring.

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, 559501 + ... + 685289.

It is an arithmetic number, because the mean of its divisors is an integer number (5654763660).

Almost surely, 2^78290444655 is an apocalyptic number.

78290444655 is a deficient number, since it is larger than the sum of its proper divisors (57423883185).

78290444655 is a wasteful number, since it uses less digits than its factorization.

78290444655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139631 (or 139628 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 78290444655 in words is "seventy-eight billion, two hundred ninety million, four hundred forty-four thousand, six hundred fifty-five".