53721634 has 4 divisors (see below), whose sum is σ = 80582454. Its totient is φ = 26860816.

The previous prime is 53721599. The next prime is 53721637. The reversal of 53721634 is 43612735.

53721634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 2241009 = 7175^2 + 1497^2 .

It is a junction number, because it is equal to n+sod(n) for n = 53721596 and 53721605.

It is not an unprimeable number, because it can be changed into a prime (53721637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13430407 + ... + 13430410.

Almost surely, 2^53721634 is an apocalyptic number.

53721634 is a deficient number, since it is larger than the sum of its proper divisors (26860820).

53721634 is a wasteful number, since it uses less digits than its factorization.

53721634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26860819.

The product of its digits is 15120, while the sum is 31.

The square root of 53721634 is about 7329.5043488629. The cubic root of 53721634 is about 377.3257157858.

The spelling of 53721634 in words is "fifty-three million, seven hundred twenty-one thousand, six hundred thirty-four".