78145998 has 32 divisors (see below), whose sum is σ = 183450624. Its totient is φ = 21723552.

The previous prime is 78145987. The next prime is 78146011. The reversal of 78145998 is 89954187.

It is a super-2 number, since 2×78145998² = 12213594006832008, 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 78145998.

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 15 ways as a sum of consecutive naturals, for example, 23590 + ... + 26697.

It is an arithmetic number, because the mean of its divisors is an integer number (5732832).

Almost surely, 2^78145998 is an apocalyptic number.

78145998 is an abundant number, since it is smaller than the sum of its proper divisors (105304626).

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

78145998 is a wasteful number, since it uses less digits than its factorization.

78145998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50336.

The product of its digits is 725760, while the sum is 51.

The square root of 78145998 is about 8840.0225112836. The cubic root of 78145998 is about 427.5322830516.

The spelling of 78145998 in words is "seventy-eight million, one hundred forty-five thousand, nine hundred ninety-eight".