722576506 has 4 divisors (see below), whose sum is σ = 1083864762. Its totient is φ = 361288252.

The previous prime is 722576501. The next prime is 722576509. The reversal of 722576506 is 605675227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605675227 = 71 ⋅8530637.

It can be written as a sum of positive squares in only one way, i.e., 703575625 + 19000881 = 26525^2 + 4359^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (722576501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180644125 + ... + 180644128.

Almost surely, 2^722576506 is an apocalyptic number.

722576506 is a deficient number, since it is larger than the sum of its proper divisors (361288256).

722576506 is a wasteful number, since it uses less digits than its factorization.

722576506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361288255.

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 722576506 is about 26880.7832103159. The cubic root of 722576506 is about 897.3487845631.

The spelling of 722576506 in words is "seven hundred twenty-two million, five hundred seventy-six thousand, five hundred six".