1640702672 has 30 divisors (see below), whose sum is σ = 3697860978. Its totient is φ = 703157952.

The previous prime is 1640702671. The next prime is 1640702737. The reversal of 1640702672 is 2762070461.

It can be written as a sum of positive squares in only one way, i.e., 1393080976 + 247621696 = 37324^2 + 15736^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640702671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1045583 + ... + 1047150.

Almost surely, 2^1640702672 is an apocalyptic number.

It is an amenable number.

1640702672 is an abundant number, since it is smaller than the sum of its proper divisors (2057158306).

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

1640702672 is a wasteful number, since it uses less digits than its factorization.

1640702672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092755 (or 2092742 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 1640702672 is about 40505.5881576851. The cubic root of 1640702672 is about 1179.4421072414.

The spelling of 1640702672 in words is "one billion, six hundred forty million, seven hundred two thousand, six hundred seventy-two".