78057381 has 4 divisors (see below), whose sum is σ = 104076512. Its totient is φ = 52038252.

The previous prime is 78057379. The next prime is 78057389. The reversal of 78057381 is 18375087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18375087 = 3 ⋅6125029.

It is not a de Polignac number, because 78057381 - 2¹ = 78057379 is a prime.

It is a super-2 number, since 2×78057381² = 12185909457158322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057389) 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, 13009561 + ... + 13009566.

It is an arithmetic number, because the mean of its divisors is an integer number (26019128).

Almost surely, 2^78057381 is an apocalyptic number.

It is an amenable number.

78057381 is a deficient number, since it is larger than the sum of its proper divisors (26019131).

78057381 is a wasteful number, since it uses less digits than its factorization.

78057381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26019130.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 78057381 is about 8835.0088285185. The cubic root of 78057381 is about 427.3706157478.

The spelling of 78057381 in words is "seventy-eight million, fifty-seven thousand, three hundred eighty-one".