19428780 has 96 divisors (see below), whose sum is σ = 62770176. Its totient is φ = 4398336.

The previous prime is 19428769. The next prime is 19428791. The reversal of 19428780 is 8782491.

It is an interprime number because it is at equal distance from previous prime (19428769) and next prime (19428791).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70002 + ... + 70278.

It is an arithmetic number, because the mean of its divisors is an integer number (653856).

Almost surely, 2^19428780 is an apocalyptic number.

19428780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19428780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31385088).

19428780 is an abundant number, since it is smaller than the sum of its proper divisors (43341396).

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

19428780 is a wasteful number, since it uses less digits than its factorization.

19428780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 19428780 is about 4407.8089795271. The cubic root of 19428780 is about 268.8325450426.

The spelling of 19428780 in words is "nineteen million, four hundred twenty-eight thousand, seven hundred eighty".