686621542 has 8 divisors (see below), whose sum is σ = 1063156032. Its totient is φ = 332236200.

The previous prime is 686621491. The next prime is 686621591. The reversal of 686621542 is 245126686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 686621495 and 686621504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5537209 + ... + 5537332.

It is an arithmetic number, because the mean of its divisors is an integer number (132894504).

Almost surely, 2^686621542 is an apocalyptic number.

686621542 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

686621542 is a deficient number, since it is larger than the sum of its proper divisors (376534490).

686621542 is a wasteful number, since it uses less digits than its factorization.

686621542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11074574.

The product of its digits is 138240, while the sum is 40.

The square root of 686621542 is about 26203.4643129492. The cubic root of 686621542 is about 882.2110129754.

The spelling of 686621542 in words is "six hundred eighty-six million, six hundred twenty-one thousand, five hundred forty-two".