78990100445 has 16 divisors (see below), whose sum is σ = 96844965120. Its totient is φ = 61821964224.

The previous prime is 78990100429. The next prime is 78990100451. The reversal of 78990100445 is 54400109987.

It is a cyclic number.

It is not a de Polignac number, because 78990100445 - 2⁴ = 78990100429 is a prime.

It is a super-2 number, since 2×78990100445² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78990100445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509519 + ... + 646211.

It is an arithmetic number, because the mean of its divisors is an integer number (6052810320).

Almost surely, 2^78990100445 is an apocalyptic number.

It is an amenable number.

78990100445 is a deficient number, since it is larger than the sum of its proper divisors (17854864675).

78990100445 is a wasteful number, since it uses less digits than its factorization.

78990100445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139204.

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

The spelling of 78990100445 in words is "seventy-eight billion, nine hundred ninety million, one hundred thousand, four hundred forty-five".