78057755 has 8 divisors (see below), whose sum is σ = 94989024. Its totient is φ = 61566400.

The previous prime is 78057751. The next prime is 78057781. The reversal of 78057755 is 55775087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78057755 - 2² = 78057751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78057751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109586 + ... + 110295.

It is an arithmetic number, because the mean of its divisors is an integer number (11873628).

Almost surely, 2^78057755 is an apocalyptic number.

78057755 is a deficient number, since it is larger than the sum of its proper divisors (16931269).

78057755 is a wasteful number, since it uses less digits than its factorization.

78057755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219957.

The product of its (nonzero) digits is 343000, while the sum is 44.

The square root of 78057755 is about 8835.0299942898. The cubic root of 78057755 is about 427.3712983070.

The spelling of 78057755 in words is "seventy-eight million, fifty-seven thousand, seven hundred fifty-five".