90189867 has 6 divisors (see below), whose sum is σ = 120275092. Its totient is φ = 60115612.

The previous prime is 90189863. The next prime is 90189871. The reversal of 90189867 is 76898109.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90189863) and next prime (90189871).

It is not a de Polignac number, because 90189867 - 2² = 90189863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90189863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13708 + ... + 19190.

Almost surely, 2^90189867 is an apocalyptic number.

90189867 is a deficient number, since it is larger than the sum of its proper divisors (30085225).

90189867 is an frugal number, since it uses more digits than its factorization.

90189867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10969 (or 5486 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 90189867 is about 9496.8345779002. The cubic root of 90189867 is about 448.4553906681.

Multiplying 90189867 by its sum of digits (48), we get a square (4329113616 = 65796²).

The spelling of 90189867 in words is "ninety million, one hundred eighty-nine thousand, eight hundred sixty-seven".