91628 has 6 divisors (see below), whose sum is σ = 160356. Its totient is φ = 45812.

The previous prime is 91621. The next prime is 91631. The reversal of 91628 is 82619.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 91597 and 91606.

It is not an unprimeable number, because it can be changed into a prime (91621) by changing a digit.

91628 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11450 + ... + 11457.

It is an arithmetic number, because the mean of its divisors is an integer number (26726).

2⁹¹⁶²⁸ is an apocalyptic number.

It is an amenable number.

91628 is a deficient number, since it is larger than the sum of its proper divisors (68728).

91628 is a wasteful number, since it uses less digits than its factorization.

91628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22911 (or 22909 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 91628 is about 302.7011727761. The cubic root of 91628 is about 45.0826464734.

Subtracting from 91628 its reverse (82619), we obtain a palindrome (9009).

The spelling of 91628 in words is "ninety-one thousand, six hundred twenty-eight".