726991636 has 36 divisors (see below), whose sum is σ = 1544302368. Its totient is φ = 298019568.

The previous prime is 726991609. The next prime is 726991663. The reversal of 726991636 is 636199627.

It is an interprime number because it is at equal distance from previous prime (726991609) and next prime (726991663).

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 726991636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76126 + ... + 85141.

It is an arithmetic number, because the mean of its divisors is an integer number (42897288).

Almost surely, 2^726991636 is an apocalyptic number.

It is an amenable number.

726991636 is an abundant number, since it is smaller than the sum of its proper divisors (817310732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726991636 is a wasteful number, since it uses less digits than its factorization.

726991636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161308 (or 161299 counting only the distinct ones).

The product of its digits is 734832, while the sum is 49.

The square root of 726991636 is about 26962.7824231847. The cubic root of 726991636 is about 899.1727526144.

The spelling of 726991636 in words is "seven hundred twenty-six million, nine hundred ninety-one thousand, six hundred thirty-six".