89309748978 has 18 divisors (see below), whose sum is σ = 193507203279. Its totient is φ = 29769493692.

The previous prime is 89309748961. The next prime is 89309748989. The reversal of 89309748978 is 87984790398.

It can be written as a sum of positive squares in only one way, i.e., 44654874489 + 44654874489 = 211317^2 + 211317^2 .

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

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=211317.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1232683 + ... + 1303121.

Almost surely, 2^89309748978 is an apocalyptic number.

89309748978 is an abundant number, since it is smaller than the sum of its proper divisors (104197454301).

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

89309748978 is an frugal number, since it uses more digits than its factorization.

89309748978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140886 (or 70444 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 72.

Multiplying 89309748978 by its sum of digits (72), we get a square (6430301926416 = 2535804²).

The spelling of 89309748978 in words is "eighty-nine billion, three hundred nine million, seven hundred forty-eight thousand, nine hundred seventy-eight".