689439816 has 64 divisors (see below), whose sum is σ = 2062435200. Its totient is φ = 212134464.

The previous prime is 689439799. The next prime is 689439853. The reversal of 689439816 is 618934986.

It is a super-2 number, since 2×689439816² = 950654519772227712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119956 + ... + 125571.

It is an arithmetic number, because the mean of its divisors is an integer number (32225550).

Almost surely, 2^689439816 is an apocalyptic number.

It is an amenable number.

689439816 is an abundant number, since it is smaller than the sum of its proper divisors (1372995384).

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

689439816 is a wasteful number, since it uses less digits than its factorization.

689439816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245555 (or 245545 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 689439816 is about 26257.1859878396. The cubic root of 689439816 is about 883.4163923638.

The spelling of 689439816 in words is "six hundred eighty-nine million, four hundred thirty-nine thousand, eight hundred sixteen".