68543690 has 8 divisors (see below), whose sum is σ = 123378660. Its totient is φ = 27417472.

The previous prime is 68543633. The next prime is 68543693. The reversal of 68543690 is 9634586.

It can be written as a sum of positive squares in 2 ways, for example, as 68541841 + 1849 = 8279^2 + 43^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×68543690² = 9396474877632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68543693) 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, 3427175 + ... + 3427194.

Almost surely, 2^68543690 is an apocalyptic number.

68543690 is a deficient number, since it is larger than the sum of its proper divisors (54834970).

68543690 is a wasteful number, since it uses less digits than its factorization.

68543690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854376.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 68543690 is about 8279.1116673228. Note that the first 3 decimals coincide. The cubic root of 68543690 is about 409.2504449073.

The spelling of 68543690 in words is "sixty-eight million, five hundred forty-three thousand, six hundred ninety".