723422778 has 64 divisors (see below), whose sum is σ = 1630444032. Its totient is φ = 212497920.

The previous prime is 723422753. The next prime is 723422797. The reversal of 723422778 is 877224327.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147900 + ... + 152712.

It is an arithmetic number, because the mean of its divisors is an integer number (25475688).

Almost surely, 2^723422778 is an apocalyptic number.

723422778 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 723422778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815222016).

723422778 is an abundant number, since it is smaller than the sum of its proper divisors (907021254).

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

723422778 is a wasteful number, since it uses less digits than its factorization.

723422778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4919.

The product of its digits is 263424, while the sum is 42.

The square root of 723422778 is about 26896.5198120500. The cubic root of 723422778 is about 897.6989688782.

The spelling of 723422778 in words is "seven hundred twenty-three million, four hundred twenty-two thousand, seven hundred seventy-eight".