1975967644 has 12 divisors (see below), whose sum is σ = 3951935344. Its totient is φ = 846843264.

The previous prime is 1975967641. The next prime is 1975967657. The reversal of 1975967644 is 4467695791.

1975967644 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1975967641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35285109 + ... + 35285164.

Almost surely, 2^1975967644 is an apocalyptic number.

1975967644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1975967644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1975967644 is a wasteful number, since it uses less digits than its factorization.

1975967644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70570284 (or 70570282 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 58.

The square root of 1975967644 is about 44451.8575989800. The cubic root of 1975967644 is about 1254.8542222065.

The spelling of 1975967644 in words is "one billion, nine hundred seventy-five million, nine hundred sixty-seven thousand, six hundred forty-four".