501020028 has 18 divisors (see below), whose sum is σ = 1266467384. Its totient is φ = 167006664.

The previous prime is 501020027. The next prime is 501020029. The reversal of 501020028 is 820020105.

It is an interprime number because it is at equal distance from previous prime (501020027) and next prime (501020029).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501020021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6958576 + ... + 6958647.

Almost surely, 2^501020028 is an apocalyptic number.

It is an amenable number.

501020028 is an abundant number, since it is smaller than the sum of its proper divisors (765447356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

501020028 is a wasteful number, since it uses less digits than its factorization.

501020028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13917233 (or 13917228 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 501020028 is about 22383.4766736537. The cubic root of 501020028 is about 794.2398905456.

The spelling of 501020028 in words is "five hundred one million, twenty thousand, twenty-eight".