79378454987 has 8 divisors (see below), whose sum is σ = 88432231440. Its totient is φ = 70745784480.

The previous prime is 79378454971. The next prime is 79378454993. The reversal of 79378454987 is 78945487397.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79378454987 - 2⁴ = 79378454971 is a prime.

It is a super-2 number, since 2×79378454987² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79378454987.

It is not an unprimeable number, because it can be changed into a prime (79378454387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105276089 + ... + 105276842.

It is an arithmetic number, because the mean of its divisors is an integer number (11054028930).

Almost surely, 2^79378454987 is an apocalyptic number.

79378454987 is a deficient number, since it is larger than the sum of its proper divisors (9053776453).

79378454987 is a wasteful number, since it uses less digits than its factorization.

79378454987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210552973.

The product of its digits is 426746880, while the sum is 71.

The spelling of 79378454987 in words is "seventy-nine billion, three hundred seventy-eight million, four hundred fifty-four thousand, nine hundred eighty-seven".