722626609 has 4 divisors (see below), whose sum is σ = 723221604. Its totient is φ = 722031616.

The previous prime is 722626591. The next prime is 722626621. The reversal of 722626609 is 906626227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906626227 = 13 ⋅69740479.

It can be written as a sum of positive squares in 2 ways, for example, as 205291584 + 517335025 = 14328^2 + 22745^2 .

It is a cyclic number.

It is not a de Polignac number, because 722626609 - 2¹⁷ = 722495537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722626699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295672 + ... + 298105.

It is an arithmetic number, because the mean of its divisors is an integer number (180805401).

Almost surely, 2^722626609 is an apocalyptic number.

It is an amenable number.

722626609 is a deficient number, since it is larger than the sum of its proper divisors (594995).

722626609 is a wasteful number, since it uses less digits than its factorization.

722626609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594994.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 722626609 is about 26881.7151424532. The cubic root of 722626609 is about 897.3695246170.

The spelling of 722626609 in words is "seven hundred twenty-two million, six hundred twenty-six thousand, six hundred nine".