19700028 has 18 divisors (see below), whose sum is σ = 49797384. Its totient is φ = 6566664.

The previous prime is 19700027. The next prime is 19700033. The reversal of 19700028 is 82000791.

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

It is a super-2 number, since 2×19700028² = 776182206401568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19699974 and 19700010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19700027) 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, 273576 + ... + 273647.

Almost surely, 2^19700028 is an apocalyptic number.

19700028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19700028 is an abundant number, since it is smaller than the sum of its proper divisors (30097356).

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

19700028 is a wasteful number, since it uses less digits than its factorization.

19700028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547233 (or 547228 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 19700028 is about 4438.4713584747. The cubic root of 19700028 is about 270.0778376405.

The spelling of 19700028 in words is "nineteen million, seven hundred thousand, twenty-eight".