90722215 has 4 divisors (see below), whose sum is σ = 108866664. Its totient is φ = 72577768.

The previous prime is 90722147. The next prime is 90722227. The reversal of 90722215 is 51222709.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90722215 - 2¹⁷ = 90591143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9072217 + ... + 9072226.

It is an arithmetic number, because the mean of its divisors is an integer number (27216666).

Almost surely, 2^90722215 is an apocalyptic number.

90722215 is a deficient number, since it is larger than the sum of its proper divisors (18144449).

90722215 is a wasteful number, since it uses less digits than its factorization.

90722215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18144448.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 90722215 is about 9524.8209956933. The cubic root of 90722215 is about 449.3360001373.

The spelling of 90722215 in words is "ninety million, seven hundred twenty-two thousand, two hundred fifteen".