78720255 has 20 divisors (see below), whose sum is σ = 141114072. Its totient is φ = 41983920.

The previous prime is 78720241. The next prime is 78720263. The reversal of 78720255 is 55202787.

It is not a de Polignac number, because 78720255 - 2¹² = 78716159 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 96781 + ... + 97590.

Almost surely, 2^78720255 is an apocalyptic number.

78720255 is a deficient number, since it is larger than the sum of its proper divisors (62393817).

78720255 is a wasteful number, since it uses less digits than its factorization.

78720255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194388 (or 194379 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 78720255 is about 8872.4435754757. The cubic root of 78720255 is about 428.5769706426.

The spelling of 78720255 in words is "seventy-eight million, seven hundred twenty thousand, two hundred fifty-five".