40091628 has 12 divisors (see below), whose sum is σ = 93547160. Its totient is φ = 13363872.

The previous prime is 40091591. The next prime is 40091629. The reversal of 40091628 is 82619004.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 40091595 and 40091604.

It is not an unprimeable number, because it can be changed into a prime (40091629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670473 + ... + 1670496.

Almost surely, 2^40091628 is an apocalyptic number.

It is an amenable number.

40091628 is an abundant number, since it is smaller than the sum of its proper divisors (53455532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40091628 is a wasteful number, since it uses less digits than its factorization.

40091628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340976 (or 3340974 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 40091628 is about 6331.7950061574. The cubic root of 40091628 is about 342.2561263206.

The spelling of 40091628 in words is "forty million, ninety-one thousand, six hundred twenty-eight".