912991644 has 36 divisors (see below), whose sum is σ = 2310051016. Its totient is φ = 304039008.

The previous prime is 912991643. The next prime is 912991663. The reversal of 912991644 is 446199219.

It is a tau number, because it is divible by the number of its divisors (36).

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 912991644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (912991643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27747 + ... + 50949.

Almost surely, 2^912991644 is an apocalyptic number.

It is an amenable number.

912991644 is an abundant number, since it is smaller than the sum of its proper divisors (1397059372).

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

912991644 is a wasteful number, since it uses less digits than its factorization.

912991644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24306 (or 24301 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 912991644 is about 30215.7515875412. The cubic root of 912991644 is about 970.1128731088.

The spelling of 912991644 in words is "nine hundred twelve million, nine hundred ninety-one thousand, six hundred forty-four".