90187469 has 4 divisors (see below), whose sum is σ = 92284896. Its totient is φ = 88090044.

The previous prime is 90187457. The next prime is 90187481. The reversal of 90187469 is 96478109.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (90187457) and next prime (90187481).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90187469 is a prime.

It is a super-2 number, since 2×90187469² = 16267559129251922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90187429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048649 + ... + 1048734.

It is an arithmetic number, because the mean of its divisors is an integer number (23071224).

Almost surely, 2^90187469 is an apocalyptic number.

It is an amenable number.

90187469 is a deficient number, since it is larger than the sum of its proper divisors (2097427).

90187469 is a wasteful number, since it uses less digits than its factorization.

90187469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097426.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 90187469 is about 9496.7083244670. The cubic root of 90187469 is about 448.4514160695.

The spelling of 90187469 in words is "ninety million, one hundred eighty-seven thousand, four hundred sixty-nine".