428072767 has 4 divisors (see below), whose sum is σ = 453253536. Its totient is φ = 402892000.

The previous prime is 428072747. The next prime is 428072809. The reversal of 428072767 is 767270824.

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

It is a cyclic number.

It is not a de Polignac number, because 428072767 - 2²⁷ = 293855039 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 (428072747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12590359 + ... + 12590392.

It is an arithmetic number, because the mean of its divisors is an integer number (113313384).

Almost surely, 2^428072767 is an apocalyptic number.

428072767 is a deficient number, since it is larger than the sum of its proper divisors (25180769).

428072767 is a wasteful number, since it uses less digits than its factorization.

428072767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25180768.

The product of its (nonzero) digits is 263424, while the sum is 43.

The square root of 428072767 is about 20689.9194536857. The cubic root of 428072767 is about 753.6549107191.

The spelling of 428072767 in words is "four hundred twenty-eight million, seventy-two thousand, seven hundred sixty-seven".