78181225 has 24 divisors (see below), whose sum is σ = 100707840. Its totient is φ = 60144000.

The previous prime is 78181189. The next prime is 78181237. The reversal of 78181225 is 52218187.

It is not a de Polignac number, because 78181225 - 2¹³ = 78173033 is a prime.

It is a super-2 number, since 2×78181225² = 12224607885001250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217596 + ... + 217954.

It is an arithmetic number, because the mean of its divisors is an integer number (4196160).

Almost surely, 2^78181225 is an apocalyptic number.

It is an amenable number.

78181225 is a deficient number, since it is larger than the sum of its proper divisors (22526615).

78181225 is a wasteful number, since it uses less digits than its factorization.

78181225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 676 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 78181225 is about 8842.0147590920. The cubic root of 78181225 is about 427.5965150347.

The spelling of 78181225 in words is "seventy-eight million, one hundred eighty-one thousand, two hundred twenty-five".