91651628 has 24 divisors (see below), whose sum is σ = 165745440. Its totient is φ = 44320640.

The previous prime is 91651621. The next prime is 91651633. The reversal of 91651628 is 82615619.

It is a junction number, because it is equal to n+sod(n) for n = 91651591 and 91651600.

It is not an unprimeable number, because it can be changed into a prime (91651621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12008 + ... + 18096.

It is an arithmetic number, because the mean of its divisors is an integer number (6906060).

Almost surely, 2^91651628 is an apocalyptic number.

It is an amenable number.

91651628 is a deficient number, since it is larger than the sum of its proper divisors (74093812).

91651628 is a wasteful number, since it uses less digits than its factorization.

91651628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6217 (or 6215 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 91651628 is about 9573.4856765966. The cubic root of 91651628 is about 450.8652127598.

The spelling of 91651628 in words is "ninety-one million, six hundred fifty-one thousand, six hundred twenty-eight".