90690928 has 20 divisors (see below), whose sum is σ = 176016760. Its totient is φ = 45267264.

The previous prime is 90690923. The next prime is 90690947. The reversal of 90690928 is 82909609.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90690923) 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, 5326 + ... + 14482.

It is an arithmetic number, because the mean of its divisors is an integer number (8800838).

Almost surely, 2^90690928 is an apocalyptic number.

It is an amenable number.

90690928 is a deficient number, since it is larger than the sum of its proper divisors (85325832).

90690928 is a wasteful number, since it uses less digits than its factorization.

90690928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9784 (or 9778 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 90690928 is about 9523.1784609971. The cubic root of 90690928 is about 449.2843406408.

The spelling of 90690928 in words is "ninety million, six hundred ninety thousand, nine hundred twenty-eight".