724605638 has 4 divisors (see below), whose sum is σ = 1086908460. Its totient is φ = 362302818.

The previous prime is 724605631. The next prime is 724605647. The reversal of 724605638 is 836506427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836506427 = 17863 ⋅46829.

It is a junction number, because it is equal to n+sod(n) for n = 724605595 and 724605604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724605631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181151408 + ... + 181151411.

It is an arithmetic number, because the mean of its divisors is an integer number (271727115).

Almost surely, 2^724605638 is an apocalyptic number.

724605638 is a deficient number, since it is larger than the sum of its proper divisors (362302822).

724605638 is a wasteful number, since it uses less digits than its factorization.

724605638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362302821.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 724605638 is about 26918.4999210580. The cubic root of 724605638 is about 898.1879747629.

The spelling of 724605638 in words is "seven hundred twenty-four million, six hundred five thousand, six hundred thirty-eight".