78057905 has 8 divisors (see below), whose sum is σ = 93812712. Its totient is φ = 62350848.

The previous prime is 78057899. The next prime is 78057911. The reversal of 78057905 is 50975087.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78057899) and next prime (78057911).

It can be written as a sum of positive squares in 4 ways, for example, as 758641 + 77299264 = 871^2 + 8792^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78057905 - 2⁶ = 78057841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8234 + ... + 14963.

It is an arithmetic number, because the mean of its divisors is an integer number (11726589).

Almost surely, 2^78057905 is an apocalyptic number.

It is an amenable number.

78057905 is a deficient number, since it is larger than the sum of its proper divisors (15754807).

78057905 is a wasteful number, since it uses less digits than its factorization.

78057905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23875.

The product of its (nonzero) digits is 88200, while the sum is 41.

The square root of 78057905 is about 8835.0384832212. The cubic root of 78057905 is about 427.3715720601.

It can be divided in two parts, 780 and 57905, that added together give a palindrome (58685).

The spelling of 78057905 in words is "seventy-eight million, fifty-seven thousand, nine hundred five".