78997284 has 18 divisors (see below), whose sum is σ = 199687670. Its totient is φ = 26332416.

The previous prime is 78997277. The next prime is 78997291. The reversal of 78997284 is 48279987.

It is an interprime number because it is at equal distance from previous prime (78997277) and next prime (78997291).

It can be written as a sum of positive squares in only one way, i.e., 78854400 + 142884 = 8880^2 + 378^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 78997284.

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 5 ways as a sum of consecutive naturals, for example, 1097149 + ... + 1097220.

Almost surely, 2^78997284 is an apocalyptic number.

It is an amenable number.

78997284 is an abundant number, since it is smaller than the sum of its proper divisors (120690386).

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

78997284 is a wasteful number, since it uses less digits than its factorization.

78997284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194379 (or 2194374 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 78997284 is about 8888.0416290654. The cubic root of 78997284 is about 429.0791253793.

The spelling of 78997284 in words is "seventy-eight million, nine hundred ninety-seven thousand, two hundred eighty-four".