43697820720 has 160 divisors (see below), whose sum is σ = 140211025920. Its totient is φ = 11246376960.

The previous prime is 43697820679. The next prime is 43697820721. The reversal of 43697820720 is 2702879634.

It is a super-2 number, since 2×43697820720² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 43697820720.

It is not an unprimeable number, because it can be changed into a prime (43697820721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2812012 + ... + 2827508.

It is an arithmetic number, because the mean of its divisors is an integer number (876318912).

Almost surely, 2^43697820720 is an apocalyptic number.

43697820720 is a gapful number since it is divisible by the number (40) 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 43697820720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70105512960).

43697820720 is an abundant number, since it is smaller than the sum of its proper divisors (96513205200).

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

43697820720 is a wasteful number, since it uses less digits than its factorization.

43697820720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15923 (or 15917 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The spelling of 43697820720 in words is "forty-three billion, six hundred ninety-seven million, eight hundred twenty thousand, seven hundred twenty".