43491630672 has 960 divisors, whose sum is σ = 164413476864. Its totient is φ = 10839121920.

The previous prime is 43491630661. The next prime is 43491630673. The reversal of 43491630672 is 27603619434.

43491630672 is a `hidden beast` number, since 4 + 3 + 4 + 9 + 1 + 630 + 6 + 7 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43491630673) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 649128783 + ... + 649128849.

Almost surely, 2^43491630672 is an apocalyptic number.

43491630672 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43491630672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82206738432).

43491630672 is an abundant number, since it is smaller than the sum of its proper divisors (120921846192).

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

43491630672 is a wasteful number, since it uses less digits than its factorization.

43491630672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 43491630672 in words is "forty-three billion, four hundred ninety-one million, six hundred thirty thousand, six hundred seventy-two".