722307978 has 96 divisors (see below), whose sum is σ = 1826487936. Its totient is φ = 202051584.

The previous prime is 722307973. The next prime is 722307979. The reversal of 722307978 is 879703227.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (722307973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1380825 + ... + 1381347.

It is an arithmetic number, because the mean of its divisors is an integer number (19025916).

Almost surely, 2^722307978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722307978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913243968).

722307978 is an abundant number, since it is smaller than the sum of its proper divisors (1104179958).

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

722307978 is a wasteful number, since it uses less digits than its factorization.

722307978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748 (or 745 counting only the distinct ones).

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

The square root of 722307978 is about 26875.7879512397. The cubic root of 722307978 is about 897.2376115002.

It can be divided in two parts, 72230 and 7978, that added together give a palindrome (80208).

The spelling of 722307978 in words is "seven hundred twenty-two million, three hundred seven thousand, nine hundred seventy-eight".