78554642 has 4 divisors (see below), whose sum is σ = 117831966. Its totient is φ = 39277320.

The previous prime is 78554633. The next prime is 78554659. The reversal of 78554642 is 24645587.

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., 68244121 + 10310521 = 8261^2 + 3211^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78554642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19638659 + ... + 19638662.

Almost surely, 2^78554642 is an apocalyptic number.

78554642 is a deficient number, since it is larger than the sum of its proper divisors (39277324).

78554642 is a wasteful number, since it uses less digits than its factorization.

78554642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39277323.

The product of its digits is 268800, while the sum is 41.

The square root of 78554642 is about 8863.1056633665. The cubic root of 78554642 is about 428.2762104764.

The spelling of 78554642 in words is "seventy-eight million, five hundred fifty-four thousand, six hundred forty-two".