861628617 has 8 divisors (see below), whose sum is σ = 1276486880. Its totient is φ = 574419060.

The previous prime is 861628597. The next prime is 861628619. The reversal of 861628617 is 716826168.

It is a happy number.

861628617 is a `hidden beast` number, since 8 + 6 + 1 + 6 + 28 + 617 = 666.

It is not a de Polignac number, because 861628617 - 2¹⁶ = 861563081 is a prime.

It is a super-3 number, since 3×861628617³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861628619) 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, 15956059 + ... + 15956112.

It is an arithmetic number, because the mean of its divisors is an integer number (159560860).

Almost surely, 2^861628617 is an apocalyptic number.

It is an amenable number.

861628617 is a deficient number, since it is larger than the sum of its proper divisors (414858263).

861628617 is a wasteful number, since it uses less digits than its factorization.

861628617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31912180 (or 31912174 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 861628617 is about 29353.5111528417. The cubic root of 861628617 is about 951.5684587120.

The spelling of 861628617 in words is "eight hundred sixty-one million, six hundred twenty-eight thousand, six hundred seventeen".