90520881 has 8 divisors (see below), whose sum is σ = 131666784. Its totient is φ = 54861120.

The previous prime is 90520867. The next prime is 90520957. The reversal of 90520881 is 18802509.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90520881 - 2⁷ = 90520753 is a prime.

It is a super-2 number, since 2×90520881² = 16388059794032322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2743057 = 90520881 / (9 + 0 + 5 + 2 + 0 + 8 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (90520081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1371496 + ... + 1371561.

It is an arithmetic number, because the mean of its divisors is an integer number (16458348).

Almost surely, 2^90520881 is an apocalyptic number.

It is an amenable number.

90520881 is a deficient number, since it is larger than the sum of its proper divisors (41145903).

90520881 is a wasteful number, since it uses less digits than its factorization.

90520881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743071.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 90520881 is about 9514.2462129167. The cubic root of 90520881 is about 449.0033597466.

The spelling of 90520881 in words is "ninety million, five hundred twenty thousand, eight hundred eighty-one".