90077721 has 8 divisors (see below), whose sum is σ = 123349824. Its totient is φ = 58428720.

The previous prime is 90077717. The next prime is 90077731. The reversal of 90077721 is 12777009.

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

It is not a de Polignac number, because 90077721 - 2² = 90077717 is a prime.

It is a super-2 number, since 2×90077721² = 16227991641107682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90077711) 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, 405645 + ... + 405866.

It is an arithmetic number, because the mean of its divisors is an integer number (15418728).

Almost surely, 2^90077721 is an apocalyptic number.

It is an amenable number.

90077721 is a deficient number, since it is larger than the sum of its proper divisors (33272103).

90077721 is a wasteful number, since it uses less digits than its factorization.

90077721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811551.

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 90077721 is about 9490.9283529063. The cubic root of 90077721 is about 448.2694372655.

The spelling of 90077721 in words is "ninety million, seventy-seven thousand, seven hundred twenty-one".