617364721 has 16 divisors (see below), whose sum is σ = 656309248. Its totient is φ = 579700800.

The previous prime is 617364719. The next prime is 617364749. The reversal of 617364721 is 127463716.

617364721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 617364721 - 2¹ = 617364719 is a prime.

It is a super-2 number, since 2×617364721² = 762278397470815682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (617364751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723331 + ... + 724183.

It is an arithmetic number, because the mean of its divisors is an integer number (41019328).

Almost surely, 2^617364721 is an apocalyptic number.

It is an amenable number.

617364721 is a deficient number, since it is larger than the sum of its proper divisors (38944527).

617364721 is a wasteful number, since it uses less digits than its factorization.

617364721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552.

The product of its digits is 42336, while the sum is 37.

The square root of 617364721 is about 24846.8251694256. The cubic root of 617364721 is about 851.4920603258.

The spelling of 617364721 in words is "six hundred seventeen million, three hundred sixty-four thousand, seven hundred twenty-one".