90222780 has 24 divisors (see below), whose sum is σ = 252623952. Its totient is φ = 24059392.

The previous prime is 90222749. The next prime is 90222809. The reversal of 90222780 is 8722209.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751797 + ... + 751916.

It is an arithmetic number, because the mean of its divisors is an integer number (10525998).

Almost surely, 2^90222780 is an apocalyptic number.

It is an amenable number.

90222780 is an abundant number, since it is smaller than the sum of its proper divisors (162401172).

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

90222780 is a wasteful number, since it uses less digits than its factorization.

90222780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503725 (or 1503723 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 90222780 is about 9498.5672603820. The cubic root of 90222780 is about 448.5099356618.

Adding to 90222780 its reverse (8722209), we get a palindrome (98944989).

The spelling of 90222780 in words is "ninety million, two hundred twenty-two thousand, seven hundred eighty".