1640761472 has 48 divisors (see below), whose sum is σ = 3802385070. Its totient is φ = 703180800.

The previous prime is 1640761471. The next prime is 1640761481. The reversal of 1640761472 is 2741670461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1621189696 + 19571776 = 40264^2 + 4424^2 .

It is not an unprimeable number, because it can be changed into a prime (1640761471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 124529 + ... + 137072.

Almost surely, 2^1640761472 is an apocalyptic number.

It is an amenable number.

1640761472 is an abundant number, since it is smaller than the sum of its proper divisors (2161623598).

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

1640761472 is an equidigital number, since it uses as much as digits as its factorization.

1640761472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261629 (or 261610 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 1640761472 is about 40506.3139769592. The cubic root of 1640761472 is about 1179.4561968077.

The spelling of 1640761472 in words is "one billion, six hundred forty million, seven hundred sixty-one thousand, four hundred seventy-two".