90715839 has 4 divisors (see below), whose sum is σ = 120954456. Its totient is φ = 60477224.

The previous prime is 90715829. The next prime is 90715843. The reversal of 90715839 is 93851709.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90715839 - 2⁷ = 90715711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90715839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90715829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15119304 + ... + 15119309.

It is an arithmetic number, because the mean of its divisors is an integer number (30238614).

Almost surely, 2^90715839 is an apocalyptic number.

90715839 is a deficient number, since it is larger than the sum of its proper divisors (30238617).

90715839 is a wasteful number, since it uses less digits than its factorization.

90715839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30238616.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 90715839 is about 9524.4862853594. The cubic root of 90715839 is about 449.3254733754.

The spelling of 90715839 in words is "ninety million, seven hundred fifteen thousand, eight hundred thirty-nine".