19778772 has 48 divisors (see below), whose sum is σ = 52324160. Its totient is φ = 5764608.

The previous prime is 19778767. The next prime is 19778777. The reversal of 19778772 is 27787791.

It is an interprime number because it is at equal distance from previous prime (19778767) and next prime (19778777).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19778777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373 + ... + 6300.

Almost surely, 2^19778772 is an apocalyptic number.

19778772 is a gapful number since it is divisible by the number (12) 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 19778772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26162080).

19778772 is an abundant number, since it is smaller than the sum of its proper divisors (32545388).

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

19778772 is a wasteful number, since it uses less digits than its factorization.

19778772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6712 (or 6710 counting only the distinct ones).

The product of its digits is 345744, while the sum is 48.

The square root of 19778772 is about 4447.3331334632. Note that the first 3 decimals coincide. The cubic root of 19778772 is about 270.4372066083.

The spelling of 19778772 in words is "nineteen million, seven hundred seventy-eight thousand, seven hundred seventy-two".