64729332 has 18 divisors (see below), whose sum is σ = 163621458. Its totient is φ = 21576432.

The previous prime is 64729331. The next prime is 64729393. The reversal of 64729332 is 23392746.

It is a happy number.

64729332 is a `hidden beast` number, since 647 + 2 + 9 + 3 + 3 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39388176 + 25341156 = 6276^2 + 5034^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1798037 = 64729332 / (6 + 4 + 7 + 2 + 9 + 3 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64729331) 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, 898983 + ... + 899054.

It is an arithmetic number, because the mean of its divisors is an integer number (9090081).

Almost surely, 2^64729332 is an apocalyptic number.

It is an amenable number.

64729332 is an abundant number, since it is smaller than the sum of its proper divisors (98892126).

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

64729332 is a wasteful number, since it uses less digits than its factorization.

64729332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798047 (or 1798042 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 64729332 is about 8045.4541201849. The cubic root of 64729332 is about 401.5137061749.

The spelling of 64729332 in words is "sixty-four million, seven hundred twenty-nine thousand, three hundred thirty-two".