68840511 has 4 divisors (see below), whose sum is σ = 91787352. Its totient is φ = 45893672.

The previous prime is 68840509. The next prime is 68840537. The reversal of 68840511 is 11504886.

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 68840511 - 2¹ = 68840509 is a prime.

It is a super-2 number, since 2×68840511² = 9478031909482242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68840561) 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, 11473416 + ... + 11473421.

It is an arithmetic number, because the mean of its divisors is an integer number (22946838).

Almost surely, 2^68840511 is an apocalyptic number.

68840511 is a deficient number, since it is larger than the sum of its proper divisors (22946841).

68840511 is a wasteful number, since it uses less digits than its factorization.

68840511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22946840.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 68840511 is about 8297.0181993292. The cubic root of 68840511 is about 409.8403324346.

The spelling of 68840511 in words is "sixty-eight million, eight hundred forty thousand, five hundred eleven".