74289498721 has 9 divisors (see below), whose sum is σ = 78921448761. Its totient is φ = 69915167232.

The previous prime is 74289498697. The next prime is 74289498739. The reversal of 74289498721 is 12789498247.

The square root of 74289498721 is 272561.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 13142100321 + 61147398400 = 114639^2 + 247280^2 .

It is not a de Polignac number, because 74289498721 - 2¹³ = 74289490529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74289498721.

It is not an unprimeable number, because it can be changed into a prime (74289490721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4625521 + ... + 4641553.

Almost surely, 2^74289498721 is an apocalyptic number.

74289498721 is the 272561-st square number.

74289498721 is the 136281-st centered octagonal number.

It is an amenable number.

74289498721 is a deficient number, since it is larger than the sum of its proper divisors (4631950040).

74289498721 is an frugal number, since it uses more digits than its factorization.

74289498721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32100 (or 16050 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 61.

The spelling of 74289498721 in words is "seventy-four billion, two hundred eighty-nine million, four hundred ninety-eight thousand, seven hundred twenty-one".