19970928 has 40 divisors (see below), whose sum is σ = 57325200. Its totient is φ = 6656832.

The previous prime is 19970897. The next prime is 19970941. The reversal of 19970928 is 82907991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22683 + ... + 23546.

It is an arithmetic number, because the mean of its divisors is an integer number (1433130).

Almost surely, 2^19970928 is an apocalyptic number.

19970928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19970928 is an abundant number, since it is smaller than the sum of its proper divisors (37354272).

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

19970928 is a wasteful number, since it uses less digits than its factorization.

19970928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46246 (or 46234 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 19970928 is about 4468.8844245516. The cubic root of 19970928 is about 271.3101752993.

The spelling of 19970928 in words is "nineteen million, nine hundred seventy thousand, nine hundred twenty-eight".