626989861 has 8 divisors (see below), whose sum is σ = 634927104. Its totient is φ = 619082880.

The previous prime is 626989843. The next prime is 626989871. The reversal of 626989861 is 168989626.

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

It is a cyclic number.

It is not a de Polignac number, because 626989861 - 2¹⁹ = 626465573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626989871) 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, 35676 + ... + 50266.

It is an arithmetic number, because the mean of its divisors is an integer number (79365888).

Almost surely, 2^626989861 is an apocalyptic number.

It is an amenable number.

626989861 is a deficient number, since it is larger than the sum of its proper divisors (7937243).

626989861 is a wasteful number, since it uses less digits than its factorization.

626989861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15131.

The product of its digits is 2239488, while the sum is 55.

The square root of 626989861 is about 25039.7655939508. The cubic root of 626989861 is about 855.8943759423.

The spelling of 626989861 in words is "six hundred twenty-six million, nine hundred eighty-nine thousand, eight hundred sixty-one".