43997685690 has 64 divisors (see below), whose sum is σ = 121629671424. Its totient is φ = 9977421888.

The previous prime is 43997685661. The next prime is 43997685727. The reversal of 43997685690 is 9658679934.

It is a happy number.

It is a super-2 number, since 2×43997685690² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 798184 + ... + 851523.

It is an arithmetic number, because the mean of its divisors is an integer number (1900463616).

Almost surely, 2^43997685690 is an apocalyptic number.

43997685690 is an abundant number, since it is smaller than the sum of its proper divisors (77631985734).

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

43997685690 is a wasteful number, since it uses less digits than its factorization.

43997685690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649851.

The product of its (nonzero) digits is 88179840, while the sum is 66.

The spelling of 43997685690 in words is "forty-three billion, nine hundred ninety-seven million, six hundred eighty-five thousand, six hundred ninety".