90991370 has 8 divisors (see below), whose sum is σ = 163784484. Its totient is φ = 36396544.

The previous prime is 90991367. The next prime is 90991441. The reversal of 90991370 is 7319909.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 89661961 + 1329409 = 9469^2 + 1153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4549559 + ... + 4549578.

Almost surely, 2^90991370 is an apocalyptic number.

90991370 is a deficient number, since it is larger than the sum of its proper divisors (72793114).

90991370 is a wasteful number, since it uses less digits than its factorization.

90991370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9099144.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 90991370 is about 9538.9396685376. The cubic root of 90991370 is about 449.7799253108.

The spelling of 90991370 in words is "ninety million, nine hundred ninety-one thousand, three hundred seventy".