684019973028 has 48 divisors (see below), whose sum is σ = 1920056069120. Its totient is φ = 185148262944.

The previous prime is 684019973027. The next prime is 684019973029. The reversal of 684019973028 is 820379910486.

684019973028 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (684019973027) and next prime (684019973029).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (684019973027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214290376 + ... + 214293567.

Almost surely, 2^684019973028 is an apocalyptic number.

It is an amenable number.

684019973028 is an abundant number, since it is smaller than the sum of its proper divisors (1236036096092).

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

684019973028 is a wasteful number, since it uses less digits than its factorization.

684019973028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428583976 (or 428583974 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 684019973028 in words is "six hundred eighty-four billion, nineteen million, nine hundred seventy-three thousand, twenty-eight".