78820774 has 4 divisors (see below), whose sum is σ = 118231164. Its totient is φ = 39410386.

The previous prime is 78820741. The next prime is 78820783. The reversal of 78820774 is 47702887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47702887 = 199 ⋅239713.

It is a self number, because there is not a number n which added to its sum of digits gives 78820774.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19705192 + ... + 19705195.

It is an arithmetic number, because the mean of its divisors is an integer number (29557791).

Almost surely, 2^78820774 is an apocalyptic number.

78820774 is a deficient number, since it is larger than the sum of its proper divisors (39410390).

78820774 is a wasteful number, since it uses less digits than its factorization.

78820774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39410389.

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 78820774 is about 8878.1064422545. The cubic root of 78820774 is about 428.7593117058.

The spelling of 78820774 in words is "seventy-eight million, eight hundred twenty thousand, seven hundred seventy-four".