91428438 has 16 divisors (see below), whose sum is σ = 185172480. Its totient is φ = 30090216.

The previous prime is 91428409. The next prime is 91428487. The reversal of 91428438 is 83482419.

It is a junction number, because it is equal to n+sod(n) for n = 91428396 and 91428405.

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, 95970 + ... + 96917.

It is an arithmetic number, because the mean of its divisors is an integer number (11573280).

Almost surely, 2^91428438 is an apocalyptic number.

91428438 is an abundant number, since it is smaller than the sum of its proper divisors (93744042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91428438 is a wasteful number, since it uses less digits than its factorization.

91428438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192971.

The product of its digits is 55296, while the sum is 39.

The square root of 91428438 is about 9561.8218975256. The cubic root of 91428438 is about 450.4989330283.

The spelling of 91428438 in words is "ninety-one million, four hundred twenty-eight thousand, four hundred thirty-eight".