64172667 has 32 divisors (see below), whose sum is σ = 95961600. Its totient is φ = 37889280.

The previous prime is 64172657. The next prime is 64172677. The reversal of 64172667 is 76627146.

It is an interprime number because it is at equal distance from previous prime (64172657) and next prime (64172677).

It is not a de Polignac number, because 64172667 - 2⁷ = 64172539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (64172617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106834 + ... + 107432.

It is an arithmetic number, because the mean of its divisors is an integer number (2998800).

Almost surely, 2^64172667 is an apocalyptic number.

64172667 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

64172667 is a deficient number, since it is larger than the sum of its proper divisors (31788933).

64172667 is a wasteful number, since it uses less digits than its factorization.

64172667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723.

The product of its digits is 84672, while the sum is 39.

The square root of 64172667 is about 8010.7844185198. The cubic root of 64172667 is about 400.3593998992.

The spelling of 64172667 in words is "sixty-four million, one hundred seventy-two thousand, six hundred sixty-seven".