528420621 has 4 divisors (see below), whose sum is σ = 704560832. Its totient is φ = 352280412.

The previous prime is 528420619. The next prime is 528420649. The reversal of 528420621 is 126024825.

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 not a de Polignac number, because 528420621 - 2¹ = 528420619 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 (528420611) 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, 88070101 + ... + 88070106.

It is an arithmetic number, because the mean of its divisors is an integer number (176140208).

Almost surely, 2^528420621 is an apocalyptic number.

It is an amenable number.

528420621 is a deficient number, since it is larger than the sum of its proper divisors (176140211).

528420621 is a wasteful number, since it uses less digits than its factorization.

528420621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176140210.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 528420621 is about 22987.4013537851. The cubic root of 528420621 is about 808.4625722102.

The spelling of 528420621 in words is "five hundred twenty-eight million, four hundred twenty thousand, six hundred twenty-one".