612772721 has 8 divisors (see below), whose sum is σ = 668663424. Its totient is φ = 556912720.

The previous prime is 612772711. The next prime is 612772723. The reversal of 612772721 is 127277216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 612772721 - 2²⁶ = 545663857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (612772723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60215 + ... + 69651.

It is an arithmetic number, because the mean of its divisors is an integer number (83582928).

Almost surely, 2^612772721 is an apocalyptic number.

It is an amenable number.

612772721 is a deficient number, since it is larger than the sum of its proper divisors (55890703).

612772721 is a wasteful number, since it uses less digits than its factorization.

612772721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15351.

The product of its digits is 16464, while the sum is 35.

The square root of 612772721 is about 24754.2465245864. The cubic root of 612772721 is about 849.3756527008.

The spelling of 612772721 in words is "six hundred twelve million, seven hundred seventy-two thousand, seven hundred twenty-one".