78904814 has 4 divisors (see below), whose sum is σ = 118357224. Its totient is φ = 39452406.

The previous prime is 78904801. The next prime is 78904817. The reversal of 78904814 is 41840987.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78904817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19726202 + ... + 19726205.

It is an arithmetic number, because the mean of its divisors is an integer number (29589306).

Almost surely, 2^78904814 is an apocalyptic number.

78904814 is a deficient number, since it is larger than the sum of its proper divisors (39452410).

78904814 is a wasteful number, since it uses less digits than its factorization.

78904814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39452409.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 78904814 is about 8882.8381725662. The cubic root of 78904814 is about 428.9116409798.

It can be divided in two parts, 7890481 and 4, that multiplied together give a square (31561924 = 5618²).

The spelling of 78904814 in words is "seventy-eight million, nine hundred four thousand, eight hundred fourteen".