1640588748 has 12 divisors (see below), whose sum is σ = 3828040440. Its totient is φ = 546862912.

The previous prime is 1640588737. The next prime is 1640588759. The reversal of 1640588748 is 8478850461.

It is an interprime number because it is at equal distance from previous prime (1640588737) and next prime (1640588759).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1640588748.

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, 68357853 + ... + 68357876.

It is an arithmetic number, because the mean of its divisors is an integer number (319003370).

Almost surely, 2^1640588748 is an apocalyptic number.

It is an amenable number.

1640588748 is an abundant number, since it is smaller than the sum of its proper divisors (2187451692).

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

1640588748 is a wasteful number, since it uses less digits than its factorization.

1640588748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136715736 (or 136715734 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The square root of 1640588748 is about 40504.1818581736. The cubic root of 1640588748 is about 1179.4148079882.

The spelling of 1640588748 in words is "one billion, six hundred forty million, five hundred eighty-eight thousand, seven hundred forty-eight".