1640475744 has 48 divisors (see below), whose sum is σ = 4358152512. Its totient is φ = 540234368.

The previous prime is 1640475709. The next prime is 1640475779. The reversal of 1640475744 is 4475740461.

It is an interprime number because it is at equal distance from previous prime (1640475709) and next prime (1640475779).

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1640475696 and 1640475705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94974 + ... + 110909.

It is an arithmetic number, because the mean of its divisors is an integer number (90794844).

Almost surely, 2^1640475744 is an apocalyptic number.

It is an amenable number.

1640475744 is an abundant number, since it is smaller than the sum of its proper divisors (2717676768).

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

1640475744 is a wasteful number, since it uses less digits than its factorization.

1640475744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205979 (or 205971 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 42.

The square root of 1640475744 is about 40502.7868670787. The cubic root of 1640475744 is about 1179.3877279433.

The spelling of 1640475744 in words is "one billion, six hundred forty million, four hundred seventy-five thousand, seven hundred forty-four".