90724573 has 4 divisors (see below), whose sum is σ = 90840640. Its totient is φ = 90608508.

The previous prime is 90724559. The next prime is 90724577. The reversal of 90724573 is 37542709.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37542709 = 53 ⋅708353.

It is a cyclic number.

It is not a de Polignac number, because 90724573 - 2⁵ = 90724541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90724577) 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, 56853 + ... + 58426.

It is an arithmetic number, because the mean of its divisors is an integer number (22710160).

Almost surely, 2^90724573 is an apocalyptic number.

It is an amenable number.

90724573 is a deficient number, since it is larger than the sum of its proper divisors (116067).

90724573 is a wasteful number, since it uses less digits than its factorization.

90724573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116066.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 90724573 is about 9524.9447767428. The cubic root of 90724573 is about 449.3398930651.

The spelling of 90724573 in words is "ninety million, seven hundred twenty-four thousand, five hundred seventy-three".