63078728781 has 16 divisors (see below), whose sum is σ = 86365041728. Its totient is φ = 40936665600.

The previous prime is 63078728773. The next prime is 63078728809. The reversal of 63078728781 is 18782787036.

63078728781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63078728781 - 2³ = 63078728773 is a prime.

It is a super-2 number, since 2×63078728781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63078728711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1759015 + ... + 1794516.

It is an arithmetic number, because the mean of its divisors is an integer number (5397815108).

Almost surely, 2^63078728781 is an apocalyptic number.

63078728781 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

63078728781 is a deficient number, since it is larger than the sum of its proper divisors (23286312947).

63078728781 is a wasteful number, since it uses less digits than its factorization.

63078728781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553692.

The product of its (nonzero) digits is 6322176, while the sum is 57.

The spelling of 63078728781 in words is "sixty-three billion, seventy-eight million, seven hundred twenty-eight thousand, seven hundred eighty-one".