726440642 has 16 divisors (see below), whose sum is σ = 1150718400. Its totient is φ = 342991440.

The previous prime is 726440641. The next prime is 726440653. The reversal of 726440642 is 246044627.

It is a super-3 number, since 3×726440642³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (726440641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18917 + ... + 42552.

It is an arithmetic number, because the mean of its divisors is an integer number (71919900).

Almost surely, 2^726440642 is an apocalyptic number.

726440642 is a deficient number, since it is larger than the sum of its proper divisors (424277758).

726440642 is a wasteful number, since it uses less digits than its factorization.

726440642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61801.

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 726440642 is about 26952.5628094992. The cubic root of 726440642 is about 898.9455312885.

The spelling of 726440642 in words is "seven hundred twenty-six million, four hundred forty thousand, six hundred forty-two".