78780427 has 4 divisors (see below), whose sum is σ = 85942296. Its totient is φ = 71618560.

The previous prime is 78780421. The next prime is 78780439. The reversal of 78780427 is 72408787.

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

It is a cyclic number.

It is not a de Polignac number, because 78780427 - 2¹¹ = 78778379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78780421) 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, 3580918 + ... + 3580939.

It is an arithmetic number, because the mean of its divisors is an integer number (21485574).

Almost surely, 2^78780427 is an apocalyptic number.

78780427 is a deficient number, since it is larger than the sum of its proper divisors (7161869).

78780427 is a wasteful number, since it uses less digits than its factorization.

78780427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161868.

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

The square root of 78780427 is about 8875.8338763183. The cubic root of 78780427 is about 428.6861410444.

The spelling of 78780427 in words is "seventy-eight million, seven hundred eighty thousand, four hundred twenty-seven".