726661491 has 16 divisors (see below), whose sum is σ = 1006121760. Its totient is φ = 466145280.

The previous prime is 726661477. The next prime is 726661511. The reversal of 726661491 is 194166627.

It is not a de Polignac number, because 726661491 - 2⁵ = 726661459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (726661451) 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, 31486 + ... + 49443.

It is an arithmetic number, because the mean of its divisors is an integer number (62882610).

Almost surely, 2^726661491 is an apocalyptic number.

726661491 is a deficient number, since it is larger than the sum of its proper divisors (279460269).

726661491 is a wasteful number, since it uses less digits than its factorization.

726661491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81046.

The product of its digits is 108864, while the sum is 42.

The square root of 726661491 is about 26956.6594926003. The cubic root of 726661491 is about 899.0366197614.

The spelling of 726661491 in words is "seven hundred twenty-six million, six hundred sixty-one thousand, four hundred ninety-one".