91660028 has 12 divisors (see below), whose sum is σ = 168847560. Its totient is φ = 43417872.

The previous prime is 91660027. The next prime is 91660057. The reversal of 91660028 is 82006619.

It is a junction number, because it is equal to n+sod(n) for n = 91659976 and 91660003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91660027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602951 + ... + 603102.

It is an arithmetic number, because the mean of its divisors is an integer number (14070630).

Almost surely, 2^91660028 is an apocalyptic number.

It is an amenable number.

91660028 is a deficient number, since it is larger than the sum of its proper divisors (77187532).

91660028 is a wasteful number, since it uses less digits than its factorization.

91660028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206076 (or 1206074 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 91660028 is about 9573.9243782265. The cubic root of 91660028 is about 450.8789864817.

The spelling of 91660028 in words is "ninety-one million, six hundred sixty thousand, twenty-eight".