722660987 has 4 divisors (see below), whose sum is σ = 729414936. Its totient is φ = 715907040.

The previous prime is 722660977. The next prime is 722660993. The reversal of 722660987 is 789066227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789066227 = 2659 ⋅296753.

It is not a de Polignac number, because 722660987 - 2⁴ = 722660971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722660927) 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, 3376814 + ... + 3377027.

It is an arithmetic number, because the mean of its divisors is an integer number (182353734).

Almost surely, 2^722660987 is an apocalyptic number.

722660987 is a deficient number, since it is larger than the sum of its proper divisors (6753949).

722660987 is a wasteful number, since it uses less digits than its factorization.

722660987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6753948.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 722660987 is about 26882.3545657742. The cubic root of 722660987 is about 897.3837547786.

The spelling of 722660987 in words is "seven hundred twenty-two million, six hundred sixty thousand, nine hundred eighty-seven".