64400267 has 4 divisors (see below), whose sum is σ = 68188536. Its totient is φ = 60612000.

The previous prime is 64400263. The next prime is 64400279. The reversal of 64400267 is 76200446.

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

It is a cyclic number.

It is not a de Polignac number, because 64400267 - 2² = 64400263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64400263) 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, 1894109 + ... + 1894142.

It is an arithmetic number, because the mean of its divisors is an integer number (17047134).

Almost surely, 2^64400267 is an apocalyptic number.

64400267 is a deficient number, since it is larger than the sum of its proper divisors (3788269).

64400267 is a wasteful number, since it uses less digits than its factorization.

64400267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3788268.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 64400267 is about 8024.9776946731. The cubic root of 64400267 is about 400.8321571689.

The spelling of 64400267 in words is "sixty-four million, four hundred thousand, two hundred sixty-seven".