427956781 has 8 divisors (see below), whose sum is σ = 493581440. Its totient is φ = 363454128.

The previous prime is 427956773. The next prime is 427956839. The reversal of 427956781 is 187659724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 427956781 - 2³ = 427956773 is a prime.

It is a super-2 number, since 2×427956781² = 366294012807763922, which 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 (427956481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279681 + ... + 281206.

It is an arithmetic number, because the mean of its divisors is an integer number (61697680).

Almost surely, 2^427956781 is an apocalyptic number.

It is an amenable number.

427956781 is a deficient number, since it is larger than the sum of its proper divisors (65624659).

427956781 is a wasteful number, since it uses less digits than its factorization.

427956781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561003.

The product of its digits is 846720, while the sum is 49.

The square root of 427956781 is about 20687.1163045989. The cubic root of 427956781 is about 753.5868371568.

The spelling of 427956781 in words is "four hundred twenty-seven million, nine hundred fifty-six thousand, seven hundred eighty-one".