725647 has 4 divisors (see below), whose sum is σ = 781480. Its totient is φ = 669816.

The previous prime is 725639. The next prime is 725653. The reversal of 725647 is 746527.

725647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746527 = 59 ⋅12653.

It is a cyclic number.

It is not a de Polignac number, because 725647 - 2³ = 725639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725687) 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, 27897 + ... + 27922.

It is an arithmetic number, because the mean of its divisors is an integer number (195370).

2⁷²⁵⁶⁴⁷ is an apocalyptic number.

725647 is a deficient number, since it is larger than the sum of its proper divisors (55833).

725647 is a wasteful number, since it uses less digits than its factorization.

725647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55832.

The product of its digits is 11760, while the sum is 31.

The square root of 725647 is about 851.8491650521. The cubic root of 725647 is about 89.8618043692.

The spelling of 725647 in words is "seven hundred twenty-five thousand, six hundred forty-seven".