78361774 has 4 divisors (see below), whose sum is σ = 117542664. Its totient is φ = 39180886.

The previous prime is 78361763. The next prime is 78361807. The reversal of 78361774 is 47716387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47716387 = 643 ⋅74209.

It is a super-2 number, since 2×78361774² = 12281135248854152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78361774.

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, 19590442 + ... + 19590445.

It is an arithmetic number, because the mean of its divisors is an integer number (29385666).

Almost surely, 2^78361774 is an apocalyptic number.

78361774 is a deficient number, since it is larger than the sum of its proper divisors (39180890).

78361774 is a wasteful number, since it uses less digits than its factorization.

78361774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39180889.

The product of its digits is 197568, while the sum is 43.

The square root of 78361774 is about 8852.2185919689. The cubic root of 78361774 is about 427.9254208132.

The spelling of 78361774 in words is "seventy-eight million, three hundred sixty-one thousand, seven hundred seventy-four".