9638631240 has 96 divisors (see below), whose sum is σ = 33636876480. Its totient is φ = 2203114368.

The previous prime is 9638631227. The next prime is 9638631263. The reversal of 9638631240 is 421368369.

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

It is a junction number, because it is equal to n+sod(n) for n = 9638631192 and 9638631201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 813732 + ... + 825491.

It is an arithmetic number, because the mean of its divisors is an integer number (350384130).

Almost surely, 2^9638631240 is an apocalyptic number.

It is an amenable number.

9638631240 is an abundant number, since it is smaller than the sum of its proper divisors (23998245240).

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

9638631240 is a wasteful number, since it uses less digits than its factorization.

9638631240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639251 (or 1639240 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 9638631240 is about 98176.5310041050. The cubic root of 9638631240 is about 2128.1641436173.

The spelling of 9638631240 in words is "nine billion, six hundred thirty-eight million, six hundred thirty-one thousand, two hundred forty".