687422745 has 12 divisors (see below), whose sum is σ = 1191532836. Its totient is φ = 366625440.

The previous prime is 687422719. The next prime is 687422753. The reversal of 687422745 is 547224786.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 388720656 + 298702089 = 19716^2 + 17283^2 .

It is a de Polignac number, because none of the positive numbers 2^k-687422745 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 15276061 = 687422745 / (6 + 8 + 7 + 4 + 2 + 2 + 7 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 687422745.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7637986 + ... + 7638075.

It is an arithmetic number, because the mean of its divisors is an integer number (99294403).

Almost surely, 2^687422745 is an apocalyptic number.

It is an amenable number.

687422745 is a deficient number, since it is larger than the sum of its proper divisors (504110091).

687422745 is a wasteful number, since it uses less digits than its factorization.

687422745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15276072 (or 15276069 counting only the distinct ones).

The product of its digits is 752640, while the sum is 45.

The square root of 687422745 is about 26218.7479678188. The cubic root of 687422745 is about 882.5540235555.

The spelling of 687422745 in words is "six hundred eighty-seven million, four hundred twenty-two thousand, seven hundred forty-five".