690278587 has 4 divisors (see below), whose sum is σ = 695244760. Its totient is φ = 685312416.

The previous prime is 690278551. The next prime is 690278597. The reversal of 690278587 is 785872096.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690278587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690278597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2482878 + ... + 2483155.

It is an arithmetic number, because the mean of its divisors is an integer number (173811190).

Almost surely, 2^690278587 is an apocalyptic number.

690278587 is a deficient number, since it is larger than the sum of its proper divisors (4966173).

690278587 is a wasteful number, since it uses less digits than its factorization.

690278587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966172.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The square root of 690278587 is about 26273.1533509018. The cubic root of 690278587 is about 883.7745013403.

The spelling of 690278587 in words is "six hundred ninety million, two hundred seventy-eight thousand, five hundred eighty-seven".