64067251 has 4 divisors (see below), whose sum is σ = 65430432. Its totient is φ = 62704072.

The previous prime is 64067233. The next prime is 64067279. The reversal of 64067251 is 15276046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15276046 = 2 ⋅7638023.

It is a cyclic number.

It is not a de Polignac number, because 64067251 - 2⁵ = 64067219 is a prime.

It is a super-4 number, since 4×64067251⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64061251) 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, 681520 + ... + 681613.

It is an arithmetic number, because the mean of its divisors is an integer number (16357608).

Almost surely, 2^64067251 is an apocalyptic number.

64067251 is a deficient number, since it is larger than the sum of its proper divisors (1363181).

64067251 is a wasteful number, since it uses less digits than its factorization.

64067251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363180.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 64067251 is about 8004.2020839057. The cubic root of 64067251 is about 400.1400572042.

The spelling of 64067251 in words is "sixty-four million, sixty-seven thousand, two hundred fifty-one".