90215386 has 4 divisors (see below), whose sum is σ = 135323082. Its totient is φ = 45107692.

The previous prime is 90215383. The next prime is 90215387. The reversal of 90215386 is 68351209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68351209 = 43 ⋅1589563.

It can be written as a sum of positive squares in only one way, i.e., 74494161 + 15721225 = 8631^2 + 3965^2 .

It is a super-2 number, since 2×90215386² = 16277631742257992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90215383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22553845 + ... + 22553848.

Almost surely, 2^90215386 is an apocalyptic number.

90215386 is a deficient number, since it is larger than the sum of its proper divisors (45107696).

90215386 is a wasteful number, since it uses less digits than its factorization.

90215386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45107695.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 90215386 is about 9498.1780358130. The cubic root of 90215386 is about 448.4976831277.

It can be divided in two parts, 90215 and 386, that added together give a square (90601 = 301²).

The spelling of 90215386 in words is "ninety million, two hundred fifteen thousand, three hundred eighty-six".