42878307727521 has 48 divisors (see below), whose sum is σ = 70867632785664. Its totient is φ = 24472684680192.

The previous prime is 42878307727513. The next prime is 42878307727523. The reversal of 42878307727521 is 12572770387824.

42878307727521 is a `hidden beast` number, since 4 + 2 + 8 + 7 + 8 + 30 + 7 + 72 + 7 + 521 = 666.

It is not a de Polignac number, because 42878307727521 - 2³ = 42878307727513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (42878307727523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 410372541 + ... + 410477013.

It is an arithmetic number, because the mean of its divisors is an integer number (1476409016368).

Almost surely, 2^{42878307727521} is an apocalyptic number.

It is an amenable number.

42878307727521 is a deficient number, since it is larger than the sum of its proper divisors (27989325058143).

42878307727521 is a wasteful number, since it uses less digits than its factorization.

42878307727521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112190 (or 112187 counting only the distinct ones).

The product of its (nonzero) digits is 73758720, while the sum is 63.

The spelling of 42878307727521 in words is "forty-two trillion, eight hundred seventy-eight billion, three hundred seven million, seven hundred twenty-seven thousand, five hundred twenty-one".