726774257 has 4 divisors (see below), whose sum is σ = 792844656. Its totient is φ = 660703860.

The previous prime is 726774253. The next prime is 726774271. The reversal of 726774257 is 752477627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752477627 = 11 ⋅68407057.

It is a cyclic number.

It is not a de Polignac number, because 726774257 - 2² = 726774253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726774253) 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, 33035183 + ... + 33035204.

It is an arithmetic number, because the mean of its divisors is an integer number (198211164).

Almost surely, 2^726774257 is an apocalyptic number.

It is an amenable number.

726774257 is a deficient number, since it is larger than the sum of its proper divisors (66070399).

726774257 is a wasteful number, since it uses less digits than its factorization.

726774257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66070398.

The product of its digits is 1152480, while the sum is 47.

The square root of 726774257 is about 26958.7510281912. The cubic root of 726774257 is about 899.0831226246.

The spelling of 726774257 in words is "seven hundred twenty-six million, seven hundred seventy-four thousand, two hundred fifty-seven".