723779820 has 48 divisors (see below), whose sum is σ = 2251761120. Its totient is φ = 193007808.

The previous prime is 723779813. The next prime is 723779843. The reversal of 723779820 is 28977327.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 669627 + ... + 670706.

It is an arithmetic number, because the mean of its divisors is an integer number (46911690).

Almost surely, 2^723779820 is an apocalyptic number.

It is an amenable number.

723779820 is an abundant number, since it is smaller than the sum of its proper divisors (1527981300).

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

723779820 is a wasteful number, since it uses less digits than its factorization.

723779820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340351 (or 1340343 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 723779820 is about 26903.1563204023. The cubic root of 723779820 is about 897.8466296604.

The spelling of 723779820 in words is "seven hundred twenty-three million, seven hundred seventy-nine thousand, eight hundred twenty".