64143700 has 18 divisors (see below), whose sum is σ = 139192046. Its totient is φ = 25657440.

The previous prime is 64143697. The next prime is 64143701. The reversal of 64143700 is 734146.

It can be written as a sum of positive squares in 3 ways, for example, as 10150596 + 53993104 = 3186^2 + 7348^2 .

It is a super-2 number, since 2×64143700² = 8228828499380000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64143701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 320619 + ... + 320818.

Almost surely, 2^64143700 is an apocalyptic number.

It is an amenable number.

64143700 is an abundant number, since it is smaller than the sum of its proper divisors (75048346).

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

64143700 is a wasteful number, since it uses less digits than its factorization.

64143700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641451 (or 641444 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 64143700 is about 8008.9762142236. The cubic root of 64143700 is about 400.2991512156.

Adding to 64143700 its reverse (734146), we get a palindrome (64877846).

The spelling of 64143700 in words is "sixty-four million, one hundred forty-three thousand, seven hundred".