687156972 has 48 divisors (see below), whose sum is σ = 1669352160. Its totient is φ = 219727872.

The previous prime is 687156961. The next prime is 687156973. The reversal of 687156972 is 279651786.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (687156973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48348 + ... + 60924.

It is an arithmetic number, because the mean of its divisors is an integer number (34778170).

Almost surely, 2^687156972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687156972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834676080).

687156972 is an abundant number, since it is smaller than the sum of its proper divisors (982195188).

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

687156972 is a wasteful number, since it uses less digits than its factorization.

687156972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12770 (or 12768 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The square root of 687156972 is about 26213.6791008054. The cubic root of 687156972 is about 882.4402705230.

The spelling of 687156972 in words is "six hundred eighty-seven million, one hundred fifty-six thousand, nine hundred seventy-two".