7440405623820 has 144 divisors (see below), whose sum is σ = 25065508799520. Its totient is φ = 1831484438784.

The previous prime is 7440405623813. The next prime is 7440405623831. The reversal of 7440405623820 is 283265040447.

It is a happy number.

7440405623820 is a `hidden beast` number, since 7 + 4 + 4 + 0 + 4 + 0 + 562 + 3 + 82 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40673619 + ... + 40856138.

It is an arithmetic number, because the mean of its divisors is an integer number (174066033330).

Almost surely, 2^{7440405623820} is an apocalyptic number.

It is an amenable number.

7440405623820 is an abundant number, since it is smaller than the sum of its proper divisors (17625103175700).

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

7440405623820 is a wasteful number, since it uses less digits than its factorization.

7440405623820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81529801 (or 81529780 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 45.

The spelling of 7440405623820 in words is "seven trillion, four hundred forty billion, four hundred five million, six hundred twenty-three thousand, eight hundred twenty".