63817972 has 12 divisors (see below), whose sum is σ = 111823236. Its totient is φ = 31868480.

The previous prime is 63817967. The next prime is 63817973. The reversal of 63817972 is 27971836.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 53085796 = 3276^2 + 7286^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63817973) 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, 6433 + ... + 13000.

It is an arithmetic number, because the mean of its divisors is an integer number (9318603).

Almost surely, 2^63817972 is an apocalyptic number.

It is an amenable number.

63817972 is a deficient number, since it is larger than the sum of its proper divisors (48005264).

63817972 is a wasteful number, since it uses less digits than its factorization.

63817972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20258 (or 20256 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 63817972 is about 7988.6151490731. The cubic root of 63817972 is about 399.6204149018.

The spelling of 63817972 in words is "sixty-three million, eight hundred seventeen thousand, nine hundred seventy-two".