64143969 has 8 divisors (see below), whose sum is σ = 88474560. Its totient is φ = 41288016.

The previous prime is 64143953. The next prime is 64143973. The reversal of 64143969 is 96934146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64143969 - 2⁴ = 64143953 is a prime.

It is a super-2 number, since 2×64143969² = 8228897518145922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64143969.

It is not an unprimeable number, because it can be changed into a prime (64143979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368557 + ... + 368730.

It is an arithmetic number, because the mean of its divisors is an integer number (11059320).

Almost surely, 2^64143969 is an apocalyptic number.

It is an amenable number.

64143969 is a deficient number, since it is larger than the sum of its proper divisors (24330591).

64143969 is a wasteful number, since it uses less digits than its factorization.

64143969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737319.

The product of its digits is 139968, while the sum is 42.

The square root of 64143969 is about 8008.9930078631. The cubic root of 64143969 is about 400.2997107942.

The spelling of 64143969 in words is "sixty-four million, one hundred forty-three thousand, nine hundred sixty-nine".