1640377564 has 24 divisors (see below), whose sum is σ = 3287305728. Its totient is φ = 701615280.

The previous prime is 1640377537. The next prime is 1640377577. The reversal of 1640377564 is 4657730461.

It is a self number, because there is not a number n which added to its sum of digits gives 1640377564.

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, 44152 + ... + 72319.

It is an arithmetic number, because the mean of its divisors is an integer number (136971072).

Almost surely, 2^1640377564 is an apocalyptic number.

1640377564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1640377564 is an abundant number, since it is smaller than the sum of its proper divisors (1646928164).

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

1640377564 is a wasteful number, since it uses less digits than its factorization.

1640377564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116985 (or 116983 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 43.

The square root of 1640377564 is about 40501.5748335790. The cubic root of 1640377564 is about 1179.3641992814.

The spelling of 1640377564 in words is "one billion, six hundred forty million, three hundred seventy-seven thousand, five hundred sixty-four".