1964625640 has 32 divisors (see below), whose sum is σ = 4480967880. Its totient is φ = 775084032.

The previous prime is 1964625617. The next prime is 1964625671. The reversal of 1964625640 is 465264691.

It can be written as a sum of positive squares in 4 ways, for example, as 1491040996 + 473584644 = 38614^2 + 21762^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333489 + ... + 339328.

Almost surely, 2^1964625640 is an apocalyptic number.

1964625640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1964625640 is an abundant number, since it is smaller than the sum of its proper divisors (2516342240).

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

1964625640 is a wasteful number, since it uses less digits than its factorization.

1964625640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672901 (or 672897 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 1964625640 is about 44324.0977347537. The cubic root of 1964625640 is about 1252.4486699469.

The spelling of 1964625640 in words is "one billion, nine hundred sixty-four million, six hundred twenty-five thousand, six hundred forty".