722135778 has 32 divisors (see below), whose sum is σ = 1777566336. Its totient is φ = 190453248.

The previous prime is 722135767. The next prime is 722135779. The reversal of 722135778 is 877531227.

722135778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (722135779) 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, 660751 + ... + 661842.

It is an arithmetic number, because the mean of its divisors is an integer number (55548948).

Almost surely, 2^722135778 is an apocalyptic number.

722135778 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

722135778 is an abundant number, since it is smaller than the sum of its proper divisors (1055430558).

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

722135778 is a wasteful number, since it uses less digits than its factorization.

722135778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322618.

The product of its digits is 164640, while the sum is 42.

The square root of 722135778 is about 26872.5841332761. The cubic root of 722135778 is about 897.1663046150.

The spelling of 722135778 in words is "seven hundred twenty-two million, one hundred thirty-five thousand, seven hundred seventy-eight".