4640668440 has 64 divisors (see below), whose sum is σ = 13927541760. Its totient is φ = 1237019520.

The previous prime is 4640668367. The next prime is 4640668441. The reversal of 4640668440 is 448660464.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 4640668392 and 4640668401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4640668441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373935 + ... + 386145.

It is an arithmetic number, because the mean of its divisors is an integer number (217617840).

Almost surely, 2^4640668440 is an apocalyptic number.

4640668440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4640668440 is an abundant number, since it is smaller than the sum of its proper divisors (9286873320).

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

4640668440 is a wasteful number, since it uses less digits than its factorization.

4640668440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15392 (or 15388 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 42.

The square root of 4640668440 is about 68122.4518055538. The cubic root of 4640668440 is about 1667.9902724734.

The spelling of 4640668440 in words is "four billion, six hundred forty million, six hundred sixty-eight thousand, four hundred forty".