78144568 has 32 divisors (see below), whose sum is σ = 154684800. Its totient is φ = 36907488.

The previous prime is 78144559. The next prime is 78144569. The reversal of 78144568 is 86544187.

It is a super-2 number, since 2×78144568² = 12213147015813248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78144569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79005 + ... + 79987.

It is an arithmetic number, because the mean of its divisors is an integer number (4833900).

Almost surely, 2^78144568 is an apocalyptic number.

It is an amenable number.

78144568 is a deficient number, since it is larger than the sum of its proper divisors (76540232).

78144568 is a wasteful number, since it uses less digits than its factorization.

78144568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531 (or 1527 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 78144568 is about 8839.9416287666. The cubic root of 78144568 is about 427.5296752196.

The spelling of 78144568 in words is "seventy-eight million, one hundred forty-four thousand, five hundred sixty-eight".