309628686 has 16 divisors (see below), whose sum is σ = 626216400. Its totient is φ = 102049728.

The previous prime is 309628673. The next prime is 309628687. The reversal of 309628686 is 686826903.

309628686 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309628687) 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, 289381 + ... + 290448.

It is an arithmetic number, because the mean of its divisors is an integer number (39138525).

Almost surely, 2^309628686 is an apocalyptic number.

309628686 is an abundant number, since it is smaller than the sum of its proper divisors (316587714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309628686 is a wasteful number, since it uses less digits than its factorization.

309628686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579923.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 309628686 is about 17596.2690931913. The cubic root of 309628686 is about 676.5196204969.

The spelling of 309628686 in words is "three hundred nine million, six hundred twenty-eight thousand, six hundred eighty-six".