78481881 has 9 divisors (see below), whose sum is σ = 113401119. Its totient is φ = 52303536.

The previous prime is 78481873. The next prime is 78481883. The reversal of 78481881 is 18818487.

The square root of 78481881 is 8859.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 63920025 + 14561856 = 7995^2 + 3816^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 78481881 - 2³ = 78481873 is a prime.

It is a super-2 number, since 2×78481881² = 12318811290596322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78481883) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25101 + ... + 28053.

Almost surely, 2^78481881 is an apocalyptic number.

78481881 is the 8859-th square number.

78481881 is the 4430-th centered octagonal number.

It is an amenable number.

78481881 is a deficient number, since it is larger than the sum of its proper divisors (34919238).

78481881 is an frugal number, since it uses more digits than its factorization.

78481881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5912 (or 2956 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The cubic root of 78481881 is about 428.1439397805.

The spelling of 78481881 in words is "seventy-eight million, four hundred eighty-one thousand, eight hundred eighty-one".