91451628 has 18 divisors (see below), whose sum is σ = 231169484. Its totient is φ = 30483864.

The previous prime is 91451623. The next prime is 91451681. The reversal of 91451628 is 82615419.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2540323 = 91451628 / (9 + 1 + 4 + 5 + 1 + 6 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 91451592 and 91451601.

It is not an unprimeable number, because it can be changed into a prime (91451623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1270126 + ... + 1270197.

Almost surely, 2^91451628 is an apocalyptic number.

It is an amenable number.

91451628 is an abundant number, since it is smaller than the sum of its proper divisors (139717856).

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

91451628 is a wasteful number, since it uses less digits than its factorization.

91451628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540333 (or 2540328 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 91451628 is about 9563.0344556527. The cubic root of 91451628 is about 450.5370181410.

The spelling of 91451628 in words is "ninety-one million, four hundred fifty-one thousand, six hundred twenty-eight".