90722240 has 112 divisors (see below), whose sum is σ = 249960384. Its totient is φ = 30720000.

The previous prime is 90722231. The next prime is 90722263. The reversal of 90722240 is 4222709.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

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, 226040 + ... + 226440.

Almost surely, 2^90722240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90722240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124980192).

90722240 is an abundant number, since it is smaller than the sum of its proper divisors (159238144).

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

90722240 is a wasteful number, since it uses less digits than its factorization.

90722240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 90722240 is about 9524.8223080538. The cubic root of 90722240 is about 449.3360414113.

Adding to 90722240 its reverse (4222709), we get a palindrome (94944949).

The spelling of 90722240 in words is "ninety million, seven hundred twenty-two thousand, two hundred forty".