90724415 has 4 divisors (see below), whose sum is σ = 108869304. Its totient is φ = 72579528.

The previous prime is 90724399. The next prime is 90724421. The reversal of 90724415 is 51442709.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51442709 = 19 ⋅2707511.

It is a cyclic number.

It is not a de Polignac number, because 90724415 - 2⁴ = 90724399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9072437 + ... + 9072446.

It is an arithmetic number, because the mean of its divisors is an integer number (27217326).

Almost surely, 2^90724415 is an apocalyptic number.

90724415 is a deficient number, since it is larger than the sum of its proper divisors (18144889).

90724415 is a wasteful number, since it uses less digits than its factorization.

90724415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18144888.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 90724415 is about 9524.9364827279. The cubic root of 90724415 is about 449.3396322180.

The spelling of 90724415 in words is "ninety million, seven hundred twenty-four thousand, four hundred fifteen".