90859778 has 4 divisors (see below), whose sum is σ = 136289670. Its totient is φ = 45429888.

The previous prime is 90859777. The next prime is 90859793. The reversal of 90859778 is 87795809.

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

It can be written as a sum of positive squares in only one way, i.e., 78021889 + 12837889 = 8833^2 + 3583^2 .

It is not an unprimeable number, because it can be changed into a prime (90859777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22714943 + ... + 22714946.

Almost surely, 2^90859778 is an apocalyptic number.

90859778 is a deficient number, since it is larger than the sum of its proper divisors (45429892).

90859778 is a wasteful number, since it uses less digits than its factorization.

90859778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45429891.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 90859778 is about 9532.0395509041. The cubic root of 90859778 is about 449.5629963308.

The spelling of 90859778 in words is "ninety million, eight hundred fifty-nine thousand, seven hundred seventy-eight".