91890406 has 16 divisors (see below), whose sum is σ = 147394080. Its totient is φ = 42812800.

The previous prime is 91890397. The next prime is 91890431. The reversal of 91890406 is 60409819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9946 + ... + 16813.

It is an arithmetic number, because the mean of its divisors is an integer number (9212130).

Almost surely, 2^91890406 is an apocalyptic number.

91890406 is a deficient number, since it is larger than the sum of its proper divisors (55503674).

91890406 is a wasteful number, since it uses less digits than its factorization.

91890406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26879.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 91890406 is about 9585.9483620558. The cubic root of 91890406 is about 451.2564163471.

The spelling of 91890406 in words is "ninety-one million, eight hundred ninety thousand, four hundred six".