501628421 has 8 divisors (see below), whose sum is σ = 576723840. Its totient is φ = 427391568.

The previous prime is 501628417. The next prime is 501628429. The reversal of 501628421 is 124826105.

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 501628421 - 2² = 501628417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501628429) 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, 213386 + ... + 215723.

It is an arithmetic number, because the mean of its divisors is an integer number (72090480).

Almost surely, 2^501628421 is an apocalyptic number.

It is an amenable number.

501628421 is a deficient number, since it is larger than the sum of its proper divisors (75095419).

501628421 is a wasteful number, since it uses less digits than its factorization.

501628421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429283.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 501628421 is about 22397.0627761767. The cubic root of 501628421 is about 794.5612446538.

The spelling of 501628421 in words is "five hundred one million, six hundred twenty-eight thousand, four hundred twenty-one".