90205124 has 6 divisors (see below), whose sum is σ = 157858974. Its totient is φ = 45102560.

The previous prime is 90205121. The next prime is 90205139. The reversal of 90205124 is 42150209.

It can be written as a sum of positive squares in only one way, i.e., 57486724 + 32718400 = 7582^2 + 5720^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90205124.

It is not an unprimeable number, because it can be changed into a prime (90205121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11275637 + ... + 11275644.

It is an arithmetic number, because the mean of its divisors is an integer number (26309829).

Almost surely, 2^90205124 is an apocalyptic number.

It is an amenable number.

90205124 is a deficient number, since it is larger than the sum of its proper divisors (67653850).

90205124 is a wasteful number, since it uses less digits than its factorization.

90205124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22551285 (or 22551283 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 90205124 is about 9497.6378115824. The cubic root of 90205124 is about 448.4806769460.

The spelling of 90205124 in words is "ninety million, two hundred five thousand, one hundred twenty-four".