721774055 has 8 divisors (see below), whose sum is σ = 866869344. Its totient is φ = 576925600.

The previous prime is 721774051. The next prime is 721774057. The reversal of 721774055 is 550477127.

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

It is not a de Polignac number, because 721774055 - 2² = 721774051 is a prime.

It is a super-2 number, since 2×721774055² = 1041915572942286050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721774051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55211 + ... + 67020.

It is an arithmetic number, because the mean of its divisors is an integer number (108358668).

Almost surely, 2^721774055 is an apocalyptic number.

721774055 is a deficient number, since it is larger than the sum of its proper divisors (145095289).

721774055 is a wasteful number, since it uses less digits than its factorization.

721774055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123417.

The product of its (nonzero) digits is 68600, while the sum is 38.

The square root of 721774055 is about 26865.8529550059. The cubic root of 721774055 is about 897.0164805800.

The spelling of 721774055 in words is "seven hundred twenty-one million, seven hundred seventy-four thousand, fifty-five".