723978040 has 32 divisors (see below), whose sum is σ = 1685124000. Its totient is φ = 279604864.

The previous prime is 723978019. The next prime is 723978043. The reversal of 723978040 is 40879327.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 723977984 and 723978002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723978043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310900 + ... + 313219.

It is an arithmetic number, because the mean of its divisors is an integer number (52660125).

Almost surely, 2^723978040 is an apocalyptic number.

It is an amenable number.

723978040 is an abundant number, since it is smaller than the sum of its proper divisors (961145960).

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

723978040 is a wasteful number, since it uses less digits than its factorization.

723978040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624159 (or 624155 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 723978040 is about 26906.8400225668. The cubic root of 723978040 is about 897.9285859449.

The spelling of 723978040 in words is "seven hundred twenty-three million, nine hundred seventy-eight thousand, forty".