656528987 has 4 divisors (see below), whose sum is σ = 663029376. Its totient is φ = 650028600.

The previous prime is 656528963. The next prime is 656529011. The reversal of 656528987 is 789825656.

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

It is an interprime number because it is at equal distance from previous prime (656528963) and next prime (656529011).

It is a cyclic number.

It is not a de Polignac number, because 656528987 - 2⁶ = 656528923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656528387) 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, 3250043 + ... + 3250244.

It is an arithmetic number, because the mean of its divisors is an integer number (165757344).

Almost surely, 2^656528987 is an apocalyptic number.

656528987 is a deficient number, since it is larger than the sum of its proper divisors (6500389).

656528987 is a wasteful number, since it uses less digits than its factorization.

656528987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6500388.

The product of its digits is 7257600, while the sum is 56.

The square root of 656528987 is about 25622.8216049677. The cubic root of 656528987 is about 869.1297886952.

The spelling of 656528987 in words is "six hundred fifty-six million, five hundred twenty-eight thousand, nine hundred eighty-seven".