90981577 has 8 divisors (see below), whose sum is σ = 91852992. Its totient is φ = 90114000.

The previous prime is 90981571. The next prime is 90981581. The reversal of 90981577 is 77518909.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90981577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90981571) 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, 68958 + ... + 70264.

It is an arithmetic number, because the mean of its divisors is an integer number (11481624).

Almost surely, 2^90981577 is an apocalyptic number.

It is an amenable number.

90981577 is a deficient number, since it is larger than the sum of its proper divisors (871415).

90981577 is a wasteful number, since it uses less digits than its factorization.

90981577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 90981577 is about 9538.4263377142. The cubic root of 90981577 is about 449.7637887884.

The spelling of 90981577 in words is "ninety million, nine hundred eighty-one thousand, five hundred seventy-seven".