3625731781 has 16 divisors (see below), whose sum is σ = 4222973440. Its totient is φ = 3048814080.

The previous prime is 3625731773. The next prime is 3625731827. The reversal of 3625731781 is 1871375263.

It is a cyclic number.

It is not a de Polignac number, because 3625731781 - 2³ = 3625731773 is a prime.

It is a super-2 number, since 2×3625731781² = 26291861895506863922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3625731181) 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, 65941 + ... + 107701.

It is an arithmetic number, because the mean of its divisors is an integer number (263935840).

Almost surely, 2^3625731781 is an apocalyptic number.

It is an amenable number.

3625731781 is a deficient number, since it is larger than the sum of its proper divisors (597241659).

3625731781 is a wasteful number, since it uses less digits than its factorization.

3625731781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42004.

The product of its digits is 211680, while the sum is 43.

The square root of 3625731781 is about 60214.0496977242. The cubic root of 3625731781 is about 1536.2617743054.

The spelling of 3625731781 in words is "three billion, six hundred twenty-five million, seven hundred thirty-one thousand, seven hundred eighty-one".