64238724 has 96 divisors (see below), whose sum is σ = 189665280. Its totient is φ = 18612000.

The previous prime is 64238717. The next prime is 64238737. The reversal of 64238724 is 42783246.

64238724 is a `hidden beast` number, since 642 + 3 + 8 + 7 + 2 + 4 = 666.

It is a super-2 number, since 2×64238724² = 8253227322296352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26149 + ... + 28499.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^64238724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64238724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94832640).

64238724 is an abundant number, since it is smaller than the sum of its proper divisors (125426556).

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

64238724 is a wasteful number, since it uses less digits than its factorization.

64238724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398 (or 2390 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 64238724 is about 8014.9063625223. The cubic root of 64238724 is about 400.4967245731.

It can be divided in two parts, 642387 and 24, that added together give a triangular number (642411 = T₁₁₃₃).

The spelling of 64238724 in words is "sixty-four million, two hundred thirty-eight thousand, seven hundred twenty-four".