427878657 has 6 divisors (see below), whose sum is σ = 618046962. Its totient is φ = 285252432.

The previous prime is 427878643. The next prime is 427878667. The reversal of 427878657 is 756878724.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 393585921 + 34292736 = 19839^2 + 5856^2 .

It is not a de Polignac number, because 427878657 - 2⁴ = 427878641 is a prime.

It is a super-2 number, since 2×427878657² = 366160290232247298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (427878667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23771028 + ... + 23771045.

It is an arithmetic number, because the mean of its divisors is an integer number (103007827).

Almost surely, 2^427878657 is an apocalyptic number.

It is an amenable number.

427878657 is a deficient number, since it is larger than the sum of its proper divisors (190168305).

427878657 is a wasteful number, since it uses less digits than its factorization.

427878657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47542079 (or 47542076 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 54.

The square root of 427878657 is about 20685.2279900416. The cubic root of 427878657 is about 753.5409783197.

The spelling of 427878657 in words is "four hundred twenty-seven million, eight hundred seventy-eight thousand, six hundred fifty-seven".