90915428 has 6 divisors (see below), whose sum is σ = 159102006. Its totient is φ = 45457712.

The previous prime is 90915421. The next prime is 90915443. The reversal of 90915428 is 82451909.

It can be written as a sum of positive squares in only one way, i.e., 87198244 + 3717184 = 9338^2 + 1928^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90915391 and 90915400.

It is not an unprimeable number, because it can be changed into a prime (90915421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11364425 + ... + 11364432.

It is an arithmetic number, because the mean of its divisors is an integer number (26517001).

Almost surely, 2^90915428 is an apocalyptic number.

It is an amenable number.

90915428 is a deficient number, since it is larger than the sum of its proper divisors (68186578).

90915428 is a wasteful number, since it uses less digits than its factorization.

90915428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22728861 (or 22728859 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 90915428 is about 9534.9582065156. The cubic root of 90915428 is about 449.6547607151.

The spelling of 90915428 in words is "ninety million, nine hundred fifteen thousand, four hundred twenty-eight".