78127998 has 64 divisors (see below), whose sum is σ = 176332800. Its totient is φ = 22913280.

The previous prime is 78127909. The next prime is 78128003. The reversal of 78127998 is 89972187.

It is a super-2 number, since 2×78127998² = 12207968142976008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78127998.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190818 + ... + 191226.

It is an arithmetic number, because the mean of its divisors is an integer number (2755200).

Almost surely, 2^78127998 is an apocalyptic number.

78127998 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78127998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88166400).

78127998 is an abundant number, since it is smaller than the sum of its proper divisors (98204802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78127998 is a wasteful number, since it uses less digits than its factorization.

78127998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537.

The product of its digits is 508032, while the sum is 51.

The square root of 78127998 is about 8839.0043556953. The cubic root of 78127998 is about 427.4994548743.

The spelling of 78127998 in words is "seventy-eight million, one hundred twenty-seven thousand, nine hundred ninety-eight".