90681555 has 16 divisors (see below), whose sum is σ = 147135744. Its totient is φ = 47681760.

The previous prime is 90681527. The next prime is 90681559. The reversal of 90681555 is 55518609.

It is not a de Polignac number, because 90681555 - 2⁵ = 90681523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90681559) 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, 41509 + ... + 43638.

It is an arithmetic number, because the mean of its divisors is an integer number (9195984).

Almost surely, 2^90681555 is an apocalyptic number.

90681555 is a deficient number, since it is larger than the sum of its proper divisors (56454189).

90681555 is a wasteful number, since it uses less digits than its factorization.

90681555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85226.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 90681555 is about 9522.6863331730. The cubic root of 90681555 is about 449.2688621091.

The spelling of 90681555 in words is "ninety million, six hundred eighty-one thousand, five hundred fifty-five".