93991644 has 48 divisors (see below), whose sum is σ = 244204800. Its totient is φ = 31263408.

The previous prime is 93991643. The next prime is 93991663. The reversal of 93991644 is 44619939.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 93991644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93991643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98779 + ... + 99725.

It is an arithmetic number, because the mean of its divisors is an integer number (5087600).

Almost surely, 2^93991644 is an apocalyptic number.

It is an amenable number.

93991644 is an abundant number, since it is smaller than the sum of its proper divisors (150213156).

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

93991644 is a wasteful number, since it uses less digits than its factorization.

93991644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879 (or 1871 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 93991644 is about 9694.9287774589. The cubic root of 93991644 is about 454.6701211553.

The spelling of 93991644 in words is "ninety-three million, nine hundred ninety-one thousand, six hundred forty-four".