90928990 has 32 divisors (see below), whose sum is σ = 168086016. Its totient is φ = 35404320.

The previous prime is 90928969. The next prime is 90928991. The reversal of 90928990 is 9982909.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 90928990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90928991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58159 + ... + 59701.

It is an arithmetic number, because the mean of its divisors is an integer number (5252688).

Almost surely, 2^90928990 is an apocalyptic number.

90928990 is a deficient number, since it is larger than the sum of its proper divisors (77157026).

90928990 is a wasteful number, since it uses less digits than its factorization.

90928990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 90928990 is about 9535.6693524891. The cubic root of 90928990 is about 449.6771181770.

The spelling of 90928990 in words is "ninety million, nine hundred twenty-eight thousand, nine hundred ninety".