690293287 has 4 divisors (see below), whose sum is σ = 697127976. Its totient is φ = 683458600.

The previous prime is 690293267. The next prime is 690293297. The reversal of 690293287 is 782392096.

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

It is a cyclic number.

It is not a de Polignac number, because 690293287 - 2⁷ = 690293159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690293267) 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, 3417193 + ... + 3417394.

It is an arithmetic number, because the mean of its divisors is an integer number (174281994).

Almost surely, 2^690293287 is an apocalyptic number.

690293287 is a deficient number, since it is larger than the sum of its proper divisors (6834689).

690293287 is a wasteful number, since it uses less digits than its factorization.

690293287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6834688.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 690293287 is about 26273.4331026609. The cubic root of 690293287 is about 883.7807748426.

The spelling of 690293287 in words is "six hundred ninety million, two hundred ninety-three thousand, two hundred eighty-seven".