68542778 has 8 divisors (see below), whose sum is σ = 104556960. Its totient is φ = 33690460.

The previous prime is 68542769. The next prime is 68542787. The reversal of 68542778 is 87724586.

It is an interprime number because it is at equal distance from previous prime (68542769) and next prime (68542787).

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

It is a super-2 number, since 2×68542778² = 9396224831914568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290318 + ... + 290553.

It is an arithmetic number, because the mean of its divisors is an integer number (13069620).

Almost surely, 2^68542778 is an apocalyptic number.

68542778 is a deficient number, since it is larger than the sum of its proper divisors (36014182).

68542778 is a wasteful number, since it uses less digits than its factorization.

68542778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580932.

The product of its digits is 752640, while the sum is 47.

The square root of 68542778 is about 8279.0565887666. The cubic root of 68542778 is about 409.2486298213.

The spelling of 68542778 in words is "sixty-eight million, five hundred forty-two thousand, seven hundred seventy-eight".