68581784 has 16 divisors (see below), whose sum is σ = 129444720. Its totient is φ = 34063200.

The previous prime is 68581771. The next prime is 68581787. The reversal of 68581784 is 48718586.

It is a happy number.

It is a super-2 number, since 2×68581784² = 9406922193245312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68581787) 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, 27179 + ... + 29594.

It is an arithmetic number, because the mean of its divisors is an integer number (8090295).

Almost surely, 2^68581784 is an apocalyptic number.

It is an amenable number.

68581784 is a deficient number, since it is larger than the sum of its proper divisors (60862936).

68581784 is a wasteful number, since it uses less digits than its factorization.

68581784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56930 (or 56926 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 68581784 is about 8281.4119569069. The cubic root of 68581784 is about 409.3262461917.

The spelling of 68581784 in words is "sixty-eight million, five hundred eighty-one thousand, seven hundred eighty-four".