90392778 has 48 divisors (see below), whose sum is σ = 226077696. Its totient is φ = 25567200.

The previous prime is 90392777. The next prime is 90392833. The reversal of 90392778 is 87729309.

It is not an unprimeable number, because it can be changed into a prime (90392777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9175 + ... + 16277.

It is an arithmetic number, because the mean of its divisors is an integer number (4709952).

Almost surely, 2^90392778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90392778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113038848).

90392778 is an abundant number, since it is smaller than the sum of its proper divisors (135684918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90392778 is a wasteful number, since it uses less digits than its factorization.

90392778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7219 (or 7216 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 90392778 is about 9507.5116618388. The cubic root of 90392778 is about 448.7914534581.

The spelling of 90392778 in words is "ninety million, three hundred ninety-two thousand, seven hundred seventy-eight".