1970645690 has 32 divisors (see below), whose sum is σ = 3845696400. Its totient is φ = 722732544.

The previous prime is 1970645669. The next prime is 1970645821. The reversal of 1970645690 is 965460791.

It can be written as a sum of positive squares in 8 ways, for example, as 18861649 + 1951784041 = 4343^2 + 44179^2 .

It is a super-2 number, since 2×1970645690² = 7766888871031152200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31499 + ... + 70238.

Almost surely, 2^1970645690 is an apocalyptic number.

1970645690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1970645690 is a deficient number, since it is larger than the sum of its proper divisors (1875050710).

1970645690 is a wasteful number, since it uses less digits than its factorization.

1970645690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101906.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 1970645690 is about 44391.9552396603. The cubic root of 1970645690 is about 1253.7266259662.

The spelling of 1970645690 in words is "one billion, nine hundred seventy million, six hundred forty-five thousand, six hundred ninety".