428642507 has 4 divisors (see below), whose sum is σ = 429878136. Its totient is φ = 427406880.

The previous prime is 428642479. The next prime is 428642519. The reversal of 428642507 is 705246824.

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 428642507 - 2⁶ = 428642443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428642537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617294 + ... + 617987.

It is an arithmetic number, because the mean of its divisors is an integer number (107469534).

Almost surely, 2^428642507 is an apocalyptic number.

428642507 is a deficient number, since it is larger than the sum of its proper divisors (1235629).

428642507 is a wasteful number, since it uses less digits than its factorization.

428642507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235628.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 428642507 is about 20703.6834162426. The cubic root of 428642507 is about 753.9891194691.

The spelling of 428642507 in words is "four hundred twenty-eight million, six hundred forty-two thousand, five hundred seven".