632721649 has 8 divisors (see below), whose sum is σ = 723277568. Its totient is φ = 542207520.

The previous prime is 632721647. The next prime is 632721653. The reversal of 632721649 is 946127236.

It is a happy number.

632721649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 632721649 - 2¹ = 632721647 is a prime.

It is a super-2 number, since 2×632721649² = 800673370226558402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (632721643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35464 + ... + 50230.

It is an arithmetic number, because the mean of its divisors is an integer number (90409696).

Almost surely, 2^632721649 is an apocalyptic number.

It is an amenable number.

632721649 is a deficient number, since it is larger than the sum of its proper divisors (90555919).

632721649 is a wasteful number, since it uses less digits than its factorization.

632721649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20895.

The product of its digits is 108864, while the sum is 40.

The square root of 632721649 is about 25153.9589130618. The cubic root of 632721649 is about 858.4945941477.

The spelling of 632721649 in words is "six hundred thirty-two million, seven hundred twenty-one thousand, six hundred forty-nine".