91309628 has 24 divisors (see below), whose sum is σ = 162558480. Its totient is φ = 44870400.

The previous prime is 91309607. The next prime is 91309633. The reversal of 91309628 is 82690319.

It is a junction number, because it is equal to n+sod(n) for n = 91309591 and 91309600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75428 + ... + 76628.

It is an arithmetic number, because the mean of its divisors is an integer number (6773270).

Almost surely, 2^91309628 is an apocalyptic number.

It is an amenable number.

91309628 is a deficient number, since it is larger than the sum of its proper divisors (71248852).

91309628 is a wasteful number, since it uses less digits than its factorization.

91309628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1515 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 91309628 is about 9555.6071497315. The cubic root of 91309628 is about 450.3037093808.

The spelling of 91309628 in words is "ninety-one million, three hundred nine thousand, six hundred twenty-eight".