90139615 has 8 divisors (see below), whose sum is σ = 108219600. Its totient is φ = 72076992.

The previous prime is 90139613. The next prime is 90139619. The reversal of 90139615 is 51693109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90139615 - 2¹ = 90139613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90139613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14632 + ... + 19858.

It is an arithmetic number, because the mean of its divisors is an integer number (13527450).

Almost surely, 2^90139615 is an apocalyptic number.

90139615 is a deficient number, since it is larger than the sum of its proper divisors (18079985).

90139615 is a wasteful number, since it uses less digits than its factorization.

90139615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8681.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 90139615 is about 9494.1884855948. The cubic root of 90139615 is about 448.3720850528.

The spelling of 90139615 in words is "ninety million, one hundred thirty-nine thousand, six hundred fifteen".