68644418 has 4 divisors (see below), whose sum is σ = 102966630. Its totient is φ = 34322208.

The previous prime is 68644409. The next prime is 68644423. The reversal of 68644418 is 81444686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51940849 + 16703569 = 7207^2 + 4087^2 .

It is a super-2 number, since 2×68644418² = 9424112245117448, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17161103 + ... + 17161106.

Almost surely, 2^68644418 is an apocalyptic number.

68644418 is a deficient number, since it is larger than the sum of its proper divisors (34322212).

68644418 is a wasteful number, since it uses less digits than its factorization.

68644418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34322211.

The product of its digits is 147456, while the sum is 41.

The square root of 68644418 is about 8285.1926954055. The cubic root of 68644418 is about 409.4508173621.

The spelling of 68644418 in words is "sixty-eight million, six hundred forty-four thousand, four hundred eighteen".