90712989 has 24 divisors (see below), whose sum is σ = 137142720. Its totient is φ = 57670272.

The previous prime is 90712981. The next prime is 90712991. The reversal of 90712989 is 98921709.

It is not a de Polignac number, because 90712989 - 2³ = 90712981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90712981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122382 + ... + 123120.

It is an arithmetic number, because the mean of its divisors is an integer number (5714280).

Almost surely, 2^90712989 is an apocalyptic number.

It is an amenable number.

90712989 is a deficient number, since it is larger than the sum of its proper divisors (46429731).

90712989 is a wasteful number, since it uses less digits than its factorization.

90712989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 90712989 is about 9524.3366698159. The cubic root of 90712989 is about 449.3207678722.

The spelling of 90712989 in words is "ninety million, seven hundred twelve thousand, nine hundred eighty-nine".