724637 has 4 divisors (see below), whose sum is σ = 727776. Its totient is φ = 721500.

The previous prime is 724631. The next prime is 724639. The reversal of 724637 is 736427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 736427 = 151 ⋅4877.

It is a cyclic number.

It is not a de Polignac number, because 724637 - 2⁴ = 724621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (181944).

2⁷²⁴⁶³⁷ is an apocalyptic number.

It is an amenable number.

724637 is a deficient number, since it is larger than the sum of its proper divisors (3139).

724637 is a wasteful number, since it uses less digits than its factorization.

724637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138.

The product of its digits is 7056, while the sum is 29.

The square root of 724637 is about 851.2561306681. The cubic root of 724637 is about 89.8200932876.

The spelling of 724637 in words is "seven hundred twenty-four thousand, six hundred thirty-seven".