90657619 has 4 divisors (see below), whose sum is σ = 97631296. Its totient is φ = 83683944.

The previous prime is 90657599. The next prime is 90657691. The reversal of 90657619 is 91675609.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90657619 - 2⁵ = 90657587 is a prime.

It is a super-2 number, since 2×90657619² = 16437607765498322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90657419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3486819 + ... + 3486844.

It is an arithmetic number, because the mean of its divisors is an integer number (24407824).

Almost surely, 2^90657619 is an apocalyptic number.

90657619 is a deficient number, since it is larger than the sum of its proper divisors (6973677).

90657619 is a wasteful number, since it uses less digits than its factorization.

90657619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6973676.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 90657619 is about 9521.4294620083. The cubic root of 90657619 is about 449.2293294618.

The spelling of 90657619 in words is "ninety million, six hundred fifty-seven thousand, six hundred nineteen".