40000433664 has 80 divisors (see below), whose sum is σ = 106738346880. Its totient is φ = 13311621120.

The previous prime is 40000433663. The next prime is 40000433687. The reversal of 40000433664 is 46633400004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000433663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929749 + ... + 971819.

It is an arithmetic number, because the mean of its divisors is an integer number (1334229336).

Almost surely, 2^40000433664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40000433664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53369173440).

40000433664 is an abundant number, since it is smaller than the sum of its proper divisors (66737913216).

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

40000433664 is an equidigital number, since it uses as much as digits as its factorization.

40000433664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42711 (or 42695 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 40000433664 its reverse (46633400004), we get a palindrome (86633833668).

The spelling of 40000433664 in words is "forty billion, four hundred thirty-three thousand, six hundred sixty-four".