68487997 has 4 divisors (see below), whose sum is σ = 71465760. Its totient is φ = 65510236.

The previous prime is 68487961. The next prime is 68488051. The reversal of 68487997 is 79978486.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68487997 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 (68487697) 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, 1488847 + ... + 1488892.

It is an arithmetic number, because the mean of its divisors is an integer number (17866440).

Almost surely, 2^68487997 is an apocalyptic number.

It is an amenable number.

68487997 is a deficient number, since it is larger than the sum of its proper divisors (2977763).

68487997 is a wasteful number, since it uses less digits than its factorization.

68487997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977762.

The product of its digits is 6096384, while the sum is 58.

The square root of 68487997 is about 8275.7475191067. The cubic root of 68487997 is about 409.1395737199.

The spelling of 68487997 in words is "sixty-eight million, four hundred eighty-seven thousand, nine hundred ninety-seven".