91669940 has 24 divisors (see below), whose sum is σ = 192727080. Its totient is φ = 36626048.

The previous prime is 91669909. The next prime is 91669943. The reversal of 91669940 is 4996619.

It can be written as a sum of positive squares in 4 ways, for example, as 1267876 + 90402064 = 1126^2 + 9508^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91669891 and 91669900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91669943) 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, 20114 + ... + 24246.

It is an arithmetic number, because the mean of its divisors is an integer number (8030295).

Almost surely, 2^91669940 is an apocalyptic number.

It is an amenable number.

91669940 is an abundant number, since it is smaller than the sum of its proper divisors (101057140).

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

91669940 is a wasteful number, since it uses less digits than its factorization.

91669940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251 (or 5249 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 91669940 is about 9574.4420202955. The cubic root of 91669940 is about 450.8952383911.

The spelling of 91669940 in words is "ninety-one million, six hundred sixty-nine thousand, nine hundred forty".