90572728 has 8 divisors (see below), whose sum is σ = 169823880. Its totient is φ = 45286360.

The previous prime is 90572723. The next prime is 90572737. The reversal of 90572728 is 82727509.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90572723) 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 as a sum of consecutive naturals, namely, 5660788 + ... + 5660803.

It is an arithmetic number, because the mean of its divisors is an integer number (21227985).

Almost surely, 2^90572728 is an apocalyptic number.

It is an amenable number.

90572728 is a deficient number, since it is larger than the sum of its proper divisors (79251152).

90572728 is a wasteful number, since it uses less digits than its factorization.

90572728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11321597 (or 11321593 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 90572728 is about 9516.9705263808. The cubic root of 90572728 is about 449.0890675369.

The spelling of 90572728 in words is "ninety million, five hundred seventy-two thousand, seven hundred twenty-eight".