861627641 has 16 divisors (see below), whose sum is σ = 1018429440. Its totient is φ = 713653200.

The previous prime is 861627631. The next prime is 861627647. The reversal of 861627641 is 146726168.

It is a cyclic number.

It is not a de Polignac number, because 861627641 - 2⁶ = 861627577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861627647) 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, 9416 + ... + 42566.

It is an arithmetic number, because the mean of its divisors is an integer number (63651840).

Almost surely, 2^861627641 is an apocalyptic number.

It is an amenable number.

861627641 is a deficient number, since it is larger than the sum of its proper divisors (156801799).

861627641 is a wasteful number, since it uses less digits than its factorization.

861627641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33284.

The product of its digits is 96768, while the sum is 41.

The square root of 861627641 is about 29353.4945279093. The cubic root of 861627641 is about 951.5680994191.

It can be divided in two parts, 861627 and 641, that added together give a palindrome (862268).

The spelling of 861627641 in words is "eight hundred sixty-one million, six hundred twenty-seven thousand, six hundred forty-one".