64634780 has 24 divisors (see below), whose sum is σ = 155123808. Its totient is φ = 22160448.

The previous prime is 64634767. The next prime is 64634797. The reversal of 64634780 is 8743646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230699 + ... + 230978.

It is an arithmetic number, because the mean of its divisors is an integer number (6463492).

Almost surely, 2^64634780 is an apocalyptic number.

It is an amenable number.

64634780 is an abundant number, since it is smaller than the sum of its proper divisors (90489028).

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

64634780 is a wasteful number, since it uses less digits than its factorization.

64634780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461693 (or 461691 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 64634780 is about 8039.5758594593. The cubic root of 64634780 is about 401.3181100272.

The spelling of 64634780 in words is "sixty-four million, six hundred thirty-four thousand, seven hundred eighty".