78148897 has 4 divisors (see below), whose sum is σ = 78171460. Its totient is φ = 78126336.

The previous prime is 78148891. The next prime is 78148913. The reversal of 78148897 is 79884187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55338721 + 22810176 = 7439^2 + 4776^2 .

It is a cyclic number.

It is not a de Polignac number, because 78148897 - 2²³ = 69760289 is a prime.

It is a super-2 number, since 2×78148897² = 12214500204633218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78148891) 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 3 ways as a sum of consecutive naturals, for example, 4872 + ... + 13417.

It is an arithmetic number, because the mean of its divisors is an integer number (19542865).

Almost surely, 2^78148897 is an apocalyptic number.

It is an amenable number.

78148897 is a deficient number, since it is larger than the sum of its proper divisors (22563).

78148897 is a wasteful number, since it uses less digits than its factorization.

78148897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22562.

The product of its digits is 903168, while the sum is 52.

The square root of 78148897 is about 8840.1864799336. The cubic root of 78148897 is about 427.5375697406.

The spelling of 78148897 in words is "seventy-eight million, one hundred forty-eight thousand, eight hundred ninety-seven".