90509725 has 24 divisors (see below), whose sum is σ = 117135360. Its totient is φ = 69289920.

The previous prime is 90509689. The next prime is 90509729. The reversal of 90509725 is 52790509.

It is not a de Polignac number, because 90509725 - 2¹³ = 90501533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90509729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91584 + ... + 92566.

It is an arithmetic number, because the mean of its divisors is an integer number (4880640).

Almost surely, 2^90509725 is an apocalyptic number.

It is an amenable number.

90509725 is a deficient number, since it is larger than the sum of its proper divisors (26625635).

90509725 is a wasteful number, since it uses less digits than its factorization.

90509725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 90509725 is about 9513.6599161416. The cubic root of 90509725 is about 448.9849135891.

The spelling of 90509725 in words is "ninety million, five hundred nine thousand, seven hundred twenty-five".