428291087 has 4 divisors (see below), whose sum is σ = 489475536. Its totient is φ = 367106640.

The previous prime is 428291057. The next prime is 428291093. The reversal of 428291087 is 780192824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428291087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428291057) 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, 30592214 + ... + 30592227.

It is an arithmetic number, because the mean of its divisors is an integer number (122368884).

Almost surely, 2^428291087 is an apocalyptic number.

428291087 is a deficient number, since it is larger than the sum of its proper divisors (61184449).

428291087 is an equidigital number, since it uses as much as digits as its factorization.

428291087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61184448.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 428291087 is about 20695.1947804315. The cubic root of 428291087 is about 753.7830119742.

The spelling of 428291087 in words is "four hundred twenty-eight million, two hundred ninety-one thousand, eighty-seven".