91628644 has 6 divisors (see below), whose sum is σ = 160350134. Its totient is φ = 45814320.

The previous prime is 91628639. The next prime is 91628681. The reversal of 91628644 is 44682619.

It can be written as a sum of positive squares in only one way, i.e., 66227044 + 25401600 = 8138^2 + 5040^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91628597 and 91628606.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11453577 + ... + 11453584.

Almost surely, 2^91628644 is an apocalyptic number.

It is an amenable number.

91628644 is a deficient number, since it is larger than the sum of its proper divisors (68721490).

91628644 is a wasteful number, since it uses less digits than its factorization.

91628644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22907165 (or 22907163 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 91628644 is about 9572.2852026044. The cubic root of 91628644 is about 450.8275209311.

The spelling of 91628644 in words is "ninety-one million, six hundred twenty-eight thousand, six hundred forty-four".