66402312 has 16 divisors (see below), whose sum is σ = 166005840. Its totient is φ = 22134096.

The previous prime is 66402251. The next prime is 66402319. The reversal of 66402312 is 21320466.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 2766763 = 66402312 / (6 + 6 + 4 + 0 + 2 + 3 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (66402319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383358 + ... + 1383405.

It is an arithmetic number, because the mean of its divisors is an integer number (10375365).

Almost surely, 2^66402312 is an apocalyptic number.

It is an amenable number.

66402312 is an abundant number, since it is smaller than the sum of its proper divisors (99603528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66402312 is a wasteful number, since it uses less digits than its factorization.

66402312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766772 (or 2766768 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66402312 is about 8148.7613782709. The cubic root of 66402312 is about 404.9434702383.

Adding to 66402312 its reverse (21320466), we get a palindrome (87722778).

The spelling of 66402312 in words is "sixty-six million, four hundred two thousand, three hundred twelve".