722778624 has 120 divisors (see below), whose sum is σ = 2107997892. Its totient is φ = 238387200.

The previous prime is 722778607. The next prime is 722778689. The reversal of 722778624 is 426877227.

It can be written as a sum of positive squares in 2 ways, for example, as 719956224 + 2822400 = 26832^2 + 1680^2 .

It is a super-2 number, since 2×722778624² = 1044817878622666752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 722778624.

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 11 ways as a sum of consecutive naturals, for example, 464632 + ... + 466184.

Almost surely, 2^722778624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722778624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053998946).

722778624 is an abundant number, since it is smaller than the sum of its proper divisors (1385219268).

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

722778624 is a wasteful number, since it uses less digits than its factorization.

722778624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678 (or 1659 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 722778624 is about 26884.5424733247. The cubic root of 722778624 is about 897.4324451083.

The spelling of 722778624 in words is "seven hundred twenty-two million, seven hundred seventy-eight thousand, six hundred twenty-four".