725763981 has 16 divisors (see below), whose sum is σ = 973919744. Its totient is φ = 480734784.

The previous prime is 725763977. The next prime is 725764003. The reversal of 725763981 is 189367527.

It is not a de Polignac number, because 725763981 - 2² = 725763977 is a prime.

It is a super-2 number, since 2×725763981² = 1053466712233936722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 725763981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725763281) 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, 586095 + ... + 587331.

It is an arithmetic number, because the mean of its divisors is an integer number (60869984).

Almost surely, 2^725763981 is an apocalyptic number.

It is an amenable number.

725763981 is a deficient number, since it is larger than the sum of its proper divisors (248155763).

725763981 is a wasteful number, since it uses less digits than its factorization.

725763981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340.

The product of its digits is 635040, while the sum is 48.

The square root of 725763981 is about 26940.0070712686. The cubic root of 725763981 is about 898.6663296070. Note that the first 3 decimals are identical.

The spelling of 725763981 in words is "seven hundred twenty-five million, seven hundred sixty-three thousand, nine hundred eighty-one".