90879449 has 4 divisors (see below), whose sum is σ = 91340964. Its totient is φ = 90417936.

The previous prime is 90879431. The next prime is 90879457. The reversal of 90879449 is 94497809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94497809 = 7 ⋅13499687.

It can be written as a sum of positive squares in 2 ways, for example, as 48720400 + 42159049 = 6980^2 + 6493^2 .

It is a cyclic number.

It is not a de Polignac number, because 90879449 - 2⁸ = 90879193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90879397 and 90879406.

It is not an unprimeable number, because it can be changed into a prime (90879409) 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, 230462 + ... + 230855.

It is an arithmetic number, because the mean of its divisors is an integer number (22835241).

Almost surely, 2^90879449 is an apocalyptic number.

It is an amenable number.

90879449 is a deficient number, since it is larger than the sum of its proper divisors (461515).

90879449 is a wasteful number, since it uses less digits than its factorization.

90879449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461514.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 90879449 is about 9533.0713308986. The cubic root of 90879449 is about 449.5954372186.

The spelling of 90879449 in words is "ninety million, eight hundred seventy-nine thousand, four hundred forty-nine".