90220730 has 32 divisors (see below), whose sum is σ = 167166720. Its totient is φ = 35040960.

The previous prime is 90220729. The next prime is 90220747. The reversal of 90220730 is 3702209.

It is a junction number, because it is equal to n+sod(n) for n = 90220696 and 90220705.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64640 + ... + 66020.

It is an arithmetic number, because the mean of its divisors is an integer number (5223960).

Almost surely, 2^90220730 is an apocalyptic number.

90220730 is a deficient number, since it is larger than the sum of its proper divisors (76945990).

90220730 is a wasteful number, since it uses less digits than its factorization.

90220730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 90220730 is about 9498.4593487576. The cubic root of 90220730 is about 448.5065386914.

Adding to 90220730 its reverse (3702209), we get a palindrome (93922939).

The spelling of 90220730 in words is "ninety million, two hundred twenty thousand, seven hundred thirty".