66872897 has 24 divisors (see below), whose sum is σ = 85197672. Its totient is φ = 52012800.

The previous prime is 66872893. The next prime is 66872899. The reversal of 66872897 is 79827866.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25921 + 66846976 = 161^2 + 8176^2 .

It is not a de Polignac number, because 66872897 - 2² = 66872893 is a prime.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (66872893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37997 + ... + 39717.

It is an arithmetic number, because the mean of its divisors is an integer number (3549903).

Almost surely, 2^66872897 is an apocalyptic number.

It is an amenable number.

66872897 is a deficient number, since it is larger than the sum of its proper divisors (18324775).

66872897 is a wasteful number, since it uses less digits than its factorization.

66872897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809 (or 1802 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 53.

The square root of 66872897 is about 8177.5850347153. The cubic root of 66872897 is about 405.8978141562.

The spelling of 66872897 in words is "sixty-six million, eight hundred seventy-two thousand, eight hundred ninety-seven".