7643998320 has 160 divisors (see below), whose sum is σ = 28674736128. Its totient is φ = 1644417024.

The previous prime is 7643998277. The next prime is 7643998331. The reversal of 7643998320 is 238993467.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105264 + ... + 162383.

Almost surely, 2^7643998320 is an apocalyptic number.

7643998320 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7643998320 is an abundant number, since it is smaller than the sum of its proper divisors (21030737808).

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

7643998320 is a wasteful number, since it uses less digits than its factorization.

7643998320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267687 (or 267681 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 7643998320 is about 87429.9623698878. The cubic root of 7643998320 is about 1969.8819206542.

The spelling of 7643998320 in words is "seven billion, six hundred forty-three million, nine hundred ninety-eight thousand, three hundred twenty".