68648987 has 8 divisors (see below), whose sum is σ = 75510192. Its totient is φ = 62406960.

The previous prime is 68648947. The next prime is 68649001. The reversal of 68648987 is 78984686.

It is not a de Polignac number, because 68648987 - 2⁸ = 68648731 is a prime.

It is a super-2 number, since 2×68648987² = 9425366832252338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68648947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24458 + ... + 27119.

It is an arithmetic number, because the mean of its divisors is an integer number (9438774).

Almost surely, 2^68648987 is an apocalyptic number.

68648987 is a deficient number, since it is larger than the sum of its proper divisors (6861205).

68648987 is an equidigital number, since it uses as much as digits as its factorization.

68648987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51610 (or 51588 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 56.

The square root of 68648987 is about 8285.4684236922. The cubic root of 68648987 is about 409.4599015641.

It can be divided in two parts, 6864 and 8987, that added together give a palindrome (15851).

The spelling of 68648987 in words is "sixty-eight million, six hundred forty-eight thousand, nine hundred eighty-seven".