722057987 has 4 divisors (see below), whose sum is σ = 825209136. Its totient is φ = 618906840.

The previous prime is 722057971. The next prime is 722058013. The reversal of 722057987 is 789750227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 722057987 - 2⁴ = 722057971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722057087) 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, 51575564 + ... + 51575577.

It is an arithmetic number, because the mean of its divisors is an integer number (206302284).

Almost surely, 2^722057987 is an apocalyptic number.

722057987 is a deficient number, since it is larger than the sum of its proper divisors (103151149).

722057987 is a wasteful number, since it uses less digits than its factorization.

722057987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103151148.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 722057987 is about 26871.1366897644. The cubic root of 722057987 is about 897.1340881573.

The spelling of 722057987 in words is "seven hundred twenty-two million, fifty-seven thousand, nine hundred eighty-seven".