723128740 has 48 divisors (see below), whose sum is σ = 1627460352. Its totient is φ = 269191296.

The previous prime is 723128719. The next prime is 723128743. The reversal of 723128740 is 47821327.

It is a super-2 number, since 2×723128740² = 1045830349227975200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 723128696 and 723128705.

It is not an unprimeable number, because it can be changed into a prime (723128743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4224 + ... + 38263.

It is an arithmetic number, because the mean of its divisors is an integer number (33905424).

Almost surely, 2^723128740 is an apocalyptic number.

It is an amenable number.

723128740 is an abundant number, since it is smaller than the sum of its proper divisors (904331612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723128740 is a wasteful number, since it uses less digits than its factorization.

723128740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42556 (or 42554 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 723128740 is about 26891.0531589970. The cubic root of 723128740 is about 897.5773279845.

It can be divided in two parts, 7231287 and 40, that added together give a palindrome (7231327).

The spelling of 723128740 in words is "seven hundred twenty-three million, one hundred twenty-eight thousand, seven hundred forty".