90726228 has 18 divisors (see below), whose sum is σ = 229335834. Its totient is φ = 30242064.

The previous prime is 90726203. The next prime is 90726269. The reversal of 90726228 is 82262709.

It can be written as a sum of positive squares in only one way, i.e., 52012944 + 38713284 = 7212^2 + 6222^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2520173 = 90726228 / (9 + 0 + 7 + 2 + 6 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 90726192 and 90726201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1260051 + ... + 1260122.

Almost surely, 2^90726228 is an apocalyptic number.

It is an amenable number.

90726228 is an abundant number, since it is smaller than the sum of its proper divisors (138609606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90726228 is a wasteful number, since it uses less digits than its factorization.

90726228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520183 (or 2520178 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 90726228 is about 9525.0316534907. The cubic root of 90726228 is about 449.3426253385.

The spelling of 90726228 in words is "ninety million, seven hundred twenty-six thousand, two hundred twenty-eight".