40438764720 has 60 divisors (see below), whose sum is σ = 135806853936. Its totient is φ = 10783670400.

The previous prime is 40438764689. The next prime is 40438764721. The reversal of 40438764720 is 2746783404.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (40438764721) 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, 28081756 + ... + 28083195.

Almost surely, 2^40438764720 is an apocalyptic number.

40438764720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40438764720 is an abundant number, since it is smaller than the sum of its proper divisors (95368089216).

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

40438764720 is a wasteful number, since it uses less digits than its factorization.

40438764720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56164970 (or 56164961 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 45.

The spelling of 40438764720 in words is "forty billion, four hundred thirty-eight million, seven hundred sixty-four thousand, seven hundred twenty".