91428472 has 8 divisors (see below), whose sum is σ = 171428400. Its totient is φ = 45714232.

The previous prime is 91428409. The next prime is 91428487. The reversal of 91428472 is 27482419.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5714272 + ... + 5714287.

It is an arithmetic number, because the mean of its divisors is an integer number (21428550).

Almost surely, 2^91428472 is an apocalyptic number.

It is an amenable number.

91428472 is a deficient number, since it is larger than the sum of its proper divisors (79999928).

91428472 is a wasteful number, since it uses less digits than its factorization.

91428472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11428565 (or 11428561 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 91428472 is about 9561.8236754293. The cubic root of 91428472 is about 450.4989888714.

The spelling of 91428472 in words is "ninety-one million, four hundred twenty-eight thousand, four hundred seventy-two".