90891908435 has 4 divisors (see below), whose sum is σ = 109070290128. Its totient is φ = 72713526744.

The previous prime is 90891908411. The next prime is 90891908447. The reversal of 90891908435 is 53480919809.

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

It is a cyclic number.

It is not a de Polignac number, because 90891908435 - 2²² = 90887714131 is a prime.

It is a super-2 number, since 2×90891908435² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9089190839 + ... + 9089190848.

It is an arithmetic number, because the mean of its divisors is an integer number (27267572532).

Almost surely, 2^90891908435 is an apocalyptic number.

90891908435 is a deficient number, since it is larger than the sum of its proper divisors (18178381693).

90891908435 is a wasteful number, since it uses less digits than its factorization.

90891908435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18178381692.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 90891908435 in words is "ninety billion, eight hundred ninety-one million, nine hundred eight thousand, four hundred thirty-five".