8722731 has 4 divisors (see below), whose sum is σ = 11630312. Its totient is φ = 5815152.

The previous prime is 8722711. The next prime is 8722739. The reversal of 8722731 is 1372278.

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

It is not a de Polignac number, because 8722731 - 2⁷ = 8722603 is a prime.

It is a super-2 number, since 2×8722731² = 152172072196722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8722739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453786 + ... + 1453791.

It is an arithmetic number, because the mean of its divisors is an integer number (2907578).

Almost surely, 2^8722731 is an apocalyptic number.

8722731 is a deficient number, since it is larger than the sum of its proper divisors (2907581).

8722731 is a wasteful number, since it uses less digits than its factorization.

8722731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907580.

The product of its digits is 4704, while the sum is 30.

The square root of 8722731 is about 2953.4269924953. The cubic root of 8722731 is about 205.8499787479.

It can be divided in two parts, 8722 and 731, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 8722731 in words is "eight million, seven hundred twenty-two thousand, seven hundred thirty-one".