90509854 has 4 divisors (see below), whose sum is σ = 135764784. Its totient is φ = 45254926.

The previous prime is 90509851. The next prime is 90509873. The reversal of 90509854 is 45890509.

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

It is a super-2 number, since 2×90509854² = 16384067342202632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90509851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22627462 + ... + 22627465.

It is an arithmetic number, because the mean of its divisors is an integer number (33941196).

Almost surely, 2^90509854 is an apocalyptic number.

90509854 is a deficient number, since it is larger than the sum of its proper divisors (45254930).

90509854 is a wasteful number, since it uses less digits than its factorization.

90509854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45254929.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 90509854 is about 9513.6666958644. Note that the first 4 decimals coincide. The cubic root of 90509854 is about 448.9851268959.

The spelling of 90509854 in words is "ninety million, five hundred nine thousand, eight hundred fifty-four".