651643232 has 12 divisors (see below), whose sum is σ = 1282922676. Its totient is φ = 325821600.

The previous prime is 651643207. The next prime is 651643249. The reversal of 651643232 is 232346156.

It is a super-2 number, since 2×651643232² = 849277803622811648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 20363851 = 651643232 / (6 + 5 + 1 + 6 + 4 + 3 + 2 + 3 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10181894 + ... + 10181957.

It is an arithmetic number, because the mean of its divisors is an integer number (106910223).

Almost surely, 2^651643232 is an apocalyptic number.

It is an amenable number.

651643232 is a deficient number, since it is larger than the sum of its proper divisors (631279444).

651643232 is a wasteful number, since it uses less digits than its factorization.

651643232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20363861 (or 20363853 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 651643232 is about 25527.3036570649. The cubic root of 651643232 is about 866.9684561088.

Adding to 651643232 its reverse (232346156), we get a palindrome (883989388).

The spelling of 651643232 in words is "six hundred fifty-one million, six hundred forty-three thousand, two hundred thirty-two".