78180897 has 16 divisors (see below), whose sum is σ = 108239040. Its totient is φ = 50135232.

The previous prime is 78180871. The next prime is 78180899. The reversal of 78180897 is 79808187.

It is not a de Polignac number, because 78180897 - 2²² = 73986593 is a prime.

It is a super-2 number, since 2×78180897² = 12224505311449218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78180899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23958 + ... + 27024.

It is an arithmetic number, because the mean of its divisors is an integer number (6764940).

Almost surely, 2^78180897 is an apocalyptic number.

It is an amenable number.

78180897 is a deficient number, since it is larger than the sum of its proper divisors (30058143).

78180897 is a wasteful number, since it uses less digits than its factorization.

78180897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392.

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 78180897 is about 8841.9962112636. The cubic root of 78180897 is about 427.5959170571.

The spelling of 78180897 in words is "seventy-eight million, one hundred eighty thousand, eight hundred ninety-seven".