687155274 has 48 divisors (see below), whose sum is σ = 1607697000. Its totient is φ = 210860928.

The previous prime is 687155267. The next prime is 687155281. The reversal of 687155274 is 472551786.

It is an interprime number because it is at equal distance from previous prime (687155267) and next prime (687155281).

It can be written as a sum of positive squares in 4 ways, for example, as 503688249 + 183467025 = 22443^2 + 13545^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87252 + ... + 94800.

Almost surely, 2^687155274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687155274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803848500).

687155274 is an abundant number, since it is smaller than the sum of its proper divisors (920541726).

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

687155274 is a wasteful number, since it uses less digits than its factorization.

687155274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7959 (or 7956 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 687155274 is about 26213.6467131149. The cubic root of 687155274 is about 882.4395436707.

It can be divided in two parts, 687 and 155274, that added together give a triangular number (155961 = T₅₅₈).

The spelling of 687155274 in words is "six hundred eighty-seven million, one hundred fifty-five thousand, two hundred seventy-four".