90698881 has 16 divisors (see below), whose sum is σ = 111855744. Its totient is φ = 71616384.

The previous prime is 90698843. The next prime is 90698891. The reversal of 90698881 is 18889609.

It is a happy number.

It is not a de Polignac number, because 90698881 - 2¹⁷ = 90567809 is a prime.

It is a super-2 number, since 2×90698881² = 16452574029304322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90698801) 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, 77406 + ... + 78568.

It is an arithmetic number, because the mean of its divisors is an integer number (6990984).

Almost surely, 2^90698881 is an apocalyptic number.

90698881 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

90698881 is a deficient number, since it is larger than the sum of its proper divisors (21156863).

90698881 is a wasteful number, since it uses less digits than its factorization.

90698881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 90698881 is about 9523.5960120114. The cubic root of 90698881 is about 449.2974733543.

The spelling of 90698881 in words is "ninety million, six hundred ninety-eight thousand, eight hundred eighty-one".