689178402 has 128 divisors (see below), whose sum is σ = 1785369600. Its totient is φ = 194745600.

The previous prime is 689178397. The next prime is 689178407. The reversal of 689178402 is 204871986.

It is an interprime number because it is at equal distance from previous prime (689178397) and next prime (689178407).

It is not an unprimeable number, because it can be changed into a prime (689178407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1403377 + ... + 1403867.

It is an arithmetic number, because the mean of its divisors is an integer number (13948200).

Almost surely, 2^689178402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689178402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892684800).

689178402 is an abundant number, since it is smaller than the sum of its proper divisors (1096191198).

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

689178402 is a wasteful number, since it uses less digits than its factorization.

689178402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 689178402 is about 26252.2075643173. The cubic root of 689178402 is about 883.3047236333.

It can be divided in two parts, 68 and 9178402, that added together give a triangular number (9178470 = T₄₂₈₄).

The spelling of 689178402 in words is "six hundred eighty-nine million, one hundred seventy-eight thousand, four hundred two".