6424734640 has 20 divisors (see below), whose sum is σ = 14937508224. Its totient is φ = 2569893824.

The previous prime is 6424734637. The next prime is 6424734653. The reversal of 6424734640 is 464374246.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6424734593 and 6424734602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40154512 + ... + 40154671.

Almost surely, 2^6424734640 is an apocalyptic number.

It is an amenable number.

6424734640 is an abundant number, since it is smaller than the sum of its proper divisors (8512773584).

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

6424734640 is a wasteful number, since it uses less digits than its factorization.

6424734640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80309196 (or 80309190 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 40.

The square root of 6424734640 is about 80154.4424221141. The cubic root of 6424734640 is about 1859.0242926679.

The spelling of 6424734640 in words is "six billion, four hundred twenty-four million, seven hundred thirty-four thousand, six hundred forty".