725378681 has 4 divisors (see below), whose sum is σ = 729024000. Its totient is φ = 721733364.

The previous prime is 725378663. The next prime is 725378699. The reversal of 725378681 is 186873527.

It is a happy number.

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.

It is an interprime number because it is at equal distance from previous prime (725378663) and next prime (725378699).

It is a cyclic number.

It is not a de Polignac number, because 725378681 - 2¹⁸ = 725116537 is a prime.

It is a super-2 number, since 2×725378681² = 1052348461698599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725378651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822361 + ... + 1822758.

It is an arithmetic number, because the mean of its divisors is an integer number (182256000).

Almost surely, 2^725378681 is an apocalyptic number.

It is an amenable number.

725378681 is a deficient number, since it is larger than the sum of its proper divisors (3645319).

725378681 is a wasteful number, since it uses less digits than its factorization.

725378681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645318.

The product of its digits is 564480, while the sum is 47.

The square root of 725378681 is about 26932.8550473209. The cubic root of 725378681 is about 898.5072708136.

It can be divided in two parts, 72537 and 8681, that added together give a palindrome (81218).

The spelling of 725378681 in words is "seven hundred twenty-five million, three hundred seventy-eight thousand, six hundred eighty-one".