861628307 has 4 divisors (see below), whose sum is σ = 869681016. Its totient is φ = 853575600.

The previous prime is 861628279. The next prime is 861628319. The reversal of 861628307 is 703826168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861628307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861625307) 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, 4026194 + ... + 4026407.

It is an arithmetic number, because the mean of its divisors is an integer number (217420254).

Almost surely, 2^861628307 is an apocalyptic number.

861628307 is a deficient number, since it is larger than the sum of its proper divisors (8052709).

861628307 is a wasteful number, since it uses less digits than its factorization.

861628307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8052708.

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

The square root of 861628307 is about 29353.5058723826. The cubic root of 861628307 is about 951.5683445923.

The spelling of 861628307 in words is "eight hundred sixty-one million, six hundred twenty-eight thousand, three hundred seven".