40491205720 has 32 divisors (see below), whose sum is σ = 104120244000. Its totient is φ = 13882699008.

The previous prime is 40491205697. The next prime is 40491205747. The reversal of 40491205720 is 2750219404.

40491205720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72305445 + ... + 72306004.

It is an arithmetic number, because the mean of its divisors is an integer number (3253757625).

Almost surely, 2^40491205720 is an apocalyptic number.

40491205720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40491205720 is an abundant number, since it is smaller than the sum of its proper divisors (63629038280).

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

40491205720 is a wasteful number, since it uses less digits than its factorization.

40491205720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144611467 (or 144611463 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 40491205720 in words is "forty billion, four hundred ninety-one million, two hundred five thousand, seven hundred twenty".