428187761 has 4 divisors (see below), whose sum is σ = 428938224. Its totient is φ = 427437300.

The previous prime is 428187709. The next prime is 428187763. The reversal of 428187761 is 167781824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428187761 - 2¹⁴ = 428171377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428187763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374375 + ... + 375516.

It is an arithmetic number, because the mean of its divisors is an integer number (107234556).

Almost surely, 2^428187761 is an apocalyptic number.

It is an amenable number.

428187761 is a deficient number, since it is larger than the sum of its proper divisors (750463).

428187761 is an equidigital number, since it uses as much as digits as its factorization.

428187761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750462.

The product of its digits is 150528, while the sum is 44.

The square root of 428187761 is about 20692.6982532487. The cubic root of 428187761 is about 753.7223899269.

The spelling of 428187761 in words is "four hundred twenty-eight million, one hundred eighty-seven thousand, seven hundred sixty-one".