64731078142644 has 24 divisors (see below), whose sum is σ = 155911414021888. Its totient is φ = 20880992949120.

The previous prime is 64731078142639. The next prime is 64731078142681. The reversal of 64731078142644 is 44624187013746.

It is a happy number.

It is a super-2 number, since 2×64731078142644² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87004136917 + ... + 87004137660.

Almost surely, 2^{64731078142644} is an apocalyptic number.

It is an amenable number.

64731078142644 is an abundant number, since it is smaller than the sum of its proper divisors (91180335879244).

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

64731078142644 is a wasteful number, since it uses less digits than its factorization.

64731078142644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174008274615 (or 174008274613 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 57.

The spelling of 64731078142644 in words is "sixty-four trillion, seven hundred thirty-one billion, seventy-eight million, one hundred forty-two thousand, six hundred forty-four".