78077369 has 4 divisors (see below), whose sum is σ = 79146996. Its totient is φ = 77007744.

The previous prime is 78077323. The next prime is 78077381. The reversal of 78077369 is 96377087.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62173225 + 15904144 = 7885^2 + 3988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78077369 is a prime.

It is a super-2 number, since 2×78077369² = 12192151099924322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78077269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534704 + ... + 534849.

It is an arithmetic number, because the mean of its divisors is an integer number (19786749).

Almost surely, 2^78077369 is an apocalyptic number.

It is an amenable number.

78077369 is a deficient number, since it is larger than the sum of its proper divisors (1069627).

78077369 is a wasteful number, since it uses less digits than its factorization.

78077369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069626.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 78077369 is about 8836.1399377783. The cubic root of 78077369 is about 427.4070912855.

The spelling of 78077369 in words is "seventy-eight million, seventy-seven thousand, three hundred sixty-nine".