78057881 has 8 divisors (see below), whose sum is σ = 86425824. Its totient is φ = 69901920.

The previous prime is 78057877. The next prime is 78057887. The reversal of 78057881 is 18875087.

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

It is not a de Polignac number, because 78057881 - 2² = 78057877 is a prime.

It is a super-2 number, since 2×78057881² = 12186065572420322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78057887) 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, 52220 + ... + 53693.

It is an arithmetic number, because the mean of its divisors is an integer number (10803228).

Almost surely, 2^78057881 is an apocalyptic number.

It is an amenable number.

78057881 is a deficient number, since it is larger than the sum of its proper divisors (8367943).

78057881 is a wasteful number, since it uses less digits than its factorization.

78057881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105991.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 78057881 is about 8835.0371249927. The cubic root of 78057881 is about 427.3715282596.

The spelling of 78057881 in words is "seventy-eight million, fifty-seven thousand, eight hundred eighty-one".