78090252491 has 16 divisors (see below), whose sum is σ = 82832556960. Its totient is φ = 73411603200.

The previous prime is 78090252467. The next prime is 78090252497. The reversal of 78090252491 is 19425209087.

It is a cyclic number.

It is not a de Polignac number, because 78090252491 - 2¹⁰ = 78090251467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78090252497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9879641 + ... + 9887541.

It is an arithmetic number, because the mean of its divisors is an integer number (5177034810).

Almost surely, 2^78090252491 is an apocalyptic number.

78090252491 is a deficient number, since it is larger than the sum of its proper divisors (4742304469).

78090252491 is a wasteful number, since it uses less digits than its factorization.

78090252491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11854.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 78090252491 in words is "seventy-eight billion, ninety million, two hundred fifty-two thousand, four hundred ninety-one".