64032717780 has 90 divisors (see below), whose sum is σ = 200904962874. Its totient is φ = 17072675424.

The previous prime is 64032717773. The next prime is 64032717809. The reversal of 64032717780 is 8771723046.

It can be written as a sum of positive squares in only one way, i.e., 51226174224 + 12806543556 = 226332^2 + 113166^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 10181797 + ... + 10188083.

Almost surely, 2^64032717780 is an apocalyptic number.

64032717780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64032717780 is an abundant number, since it is smaller than the sum of its proper divisors (136872245094).

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

64032717780 is an frugal number, since it uses more digits than its factorization.

64032717780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12595 (or 6297 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

Multiplying 64032717780 by its sum of digits (45), we get a square (2881472300100 = 1697490²).

64032717780 divided by its sum of digits (45) gives a square (1422949284 = 37722²).

The spelling of 64032717780 in words is "sixty-four billion, thirty-two million, seven hundred seventeen thousand, seven hundred eighty".