90138712 has 8 divisors (see below), whose sum is σ = 169010100. Its totient is φ = 45069352.

The previous prime is 90138703. The next prime is 90138733. The reversal of 90138712 is 21783109.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5633662 + ... + 5633677.

Almost surely, 2^90138712 is an apocalyptic number.

It is an amenable number.

90138712 is a deficient number, since it is larger than the sum of its proper divisors (78871388).

90138712 is a wasteful number, since it uses less digits than its factorization.

90138712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267345 (or 11267341 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 90138712 is about 9494.1409300684. The cubic root of 90138712 is about 448.3705878149.

The spelling of 90138712 in words is "ninety million, one hundred thirty-eight thousand, seven hundred twelve".