90889409992 has 8 divisors (see below), whose sum is σ = 170417643750. Its totient is φ = 45444704992.

The previous prime is 90889409969. The next prime is 90889410013. The reversal of 90889409992 is 29990498809.

It can be written as a sum of positive squares in only one way, i.e., 87761692516 + 3127717476 = 296246^2 + 55926^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5680588117 + ... + 5680588132.

Almost surely, 2^90889409992 is an apocalyptic number.

It is an amenable number.

90889409992 is a deficient number, since it is larger than the sum of its proper divisors (79528233758).

90889409992 is a wasteful number, since it uses less digits than its factorization.

90889409992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11361176255 (or 11361176251 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 67.

The spelling of 90889409992 in words is "ninety billion, eight hundred eighty-nine million, four hundred nine thousand, nine hundred ninety-two".