40720657920 has 80 divisors (see below), whose sum is σ = 130178877840. Its totient is φ = 10858840064.

The previous prime is 40720657907. The next prime is 40720657949. The reversal of 40720657920 is 2975602704.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2643405 + ... + 2658764.

It is an arithmetic number, because the mean of its divisors is an integer number (1627235973).

Almost surely, 2^40720657920 is an apocalyptic number.

40720657920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40720657920 is an abundant number, since it is smaller than the sum of its proper divisors (89458219920).

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

40720657920 is an equidigital number, since it uses as much as digits as its factorization.

40720657920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302195 (or 5302179 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 40720657920 in words is "forty billion, seven hundred twenty million, six hundred fifty-seven thousand, nine hundred twenty".