7940646420 has 48 divisors (see below), whose sum is σ = 25410069888. Its totient is φ = 1815004800.

The previous prime is 7940646419. The next prime is 7940646499. The reversal of 7940646420 is 246460497.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9452731 + ... + 9453570.

It is an arithmetic number, because the mean of its divisors is an integer number (529376456).

Almost surely, 2^7940646420 is an apocalyptic number.

7940646420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7940646420 is an abundant number, since it is smaller than the sum of its proper divisors (17469423468).

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

7940646420 is a wasteful number, since it uses less digits than its factorization.

7940646420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18906320 (or 18906318 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 7940646420 is about 89110.3047913091. The cubic root of 7940646420 is about 1995.0415855553.

The spelling of 7940646420 in words is "seven billion, nine hundred forty million, six hundred forty-six thousand, four hundred twenty".