3647863947 has 96 divisors (see below), whose sum is σ = 6273684480. Its totient is φ = 1868106240.

The previous prime is 3647863943. The next prime is 3647863949. The reversal of 3647863947 is 7493687463.

It is a happy number.

It is not a de Polignac number, because 3647863947 - 2² = 3647863943 is a prime.

It is a super-2 number, since 2×3647863947² = 26613822751644837618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3647863943) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11020572 + ... + 11020902.

It is an arithmetic number, because the mean of its divisors is an integer number (65350880).

Almost surely, 2^3647863947 is an apocalyptic number.

3647863947 is a deficient number, since it is larger than the sum of its proper divisors (2625820533).

3647863947 is a wasteful number, since it uses less digits than its factorization.

3647863947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 506 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 57.

The square root of 3647863947 is about 60397.5491804096. The cubic root of 3647863947 is about 1539.3813148414.

The spelling of 3647863947 in words is "three billion, six hundred forty-seven million, eight hundred sixty-three thousand, nine hundred forty-seven".