90778920 has 64 divisors (see below), whose sum is σ = 278994240. Its totient is φ = 23616000.

The previous prime is 90778873. The next prime is 90778927. The reversal of 90778920 is 2987709.

It is not an unprimeable number, because it can be changed into a prime (90778927) 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, 4306 + ... + 14145.

It is an arithmetic number, because the mean of its divisors is an integer number (4359285).

Almost surely, 2^90778920 is an apocalyptic number.

It is an amenable number.

90778920 is an abundant number, since it is smaller than the sum of its proper divisors (188215320).

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

90778920 is a wasteful number, since it uses less digits than its factorization.

90778920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18506 (or 18502 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 90778920 is about 9527.7972270615. The cubic root of 90778920 is about 449.4295982751.

The spelling of 90778920 in words is "ninety million, seven hundred seventy-eight thousand, nine hundred twenty".