78978146 has 16 divisors (see below), whose sum is σ = 128137464. Its totient is φ = 36292224.

The previous prime is 78978127. The next prime is 78978149. The reversal of 78978146 is 64187987.

It can be written as a sum of positive squares in 4 ways, for example, as 49547521 + 29430625 = 7039^2 + 5425^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78978094 and 78978103.

It is not an unprimeable number, because it can be changed into a prime (78978149) 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, 461 + ... + 12576.

Almost surely, 2^78978146 is an apocalyptic number.

78978146 is a deficient number, since it is larger than the sum of its proper divisors (49159318).

78978146 is a wasteful number, since it uses less digits than its factorization.

78978146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13285.

The product of its digits is 677376, while the sum is 50.

The square root of 78978146 is about 8886.9649487325. The cubic root of 78978146 is about 429.0444727976.

The spelling of 78978146 in words is "seventy-eight million, nine hundred seventy-eight thousand, one hundred forty-six".