78977938 has 8 divisors (see below), whose sum is σ = 127579788. Its totient is φ = 36451344.

The previous prime is 78977893. The next prime is 78977939. The reversal of 78977938 is 83977987.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75394489 + 3583449 = 8683^2 + 1893^2 .

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

It is not an unprimeable number, because it can be changed into a prime (78977939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518781 + ... + 1518832.

Almost surely, 2^78977938 is an apocalyptic number.

78977938 is a deficient number, since it is larger than the sum of its proper divisors (48601850).

78977938 is a wasteful number, since it uses less digits than its factorization.

78977938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037628.

The product of its digits is 5334336, while the sum is 58.

The square root of 78977938 is about 8886.9532461919. The cubic root of 78977938 is about 429.0440961477.

The spelling of 78977938 in words is "seventy-eight million, nine hundred seventy-seven thousand, nine hundred thirty-eight".