19770978000 has 160 divisors (see below), whose sum is σ = 63828236160. Its totient is φ = 5265100800.

The previous prime is 19770977983. The next prime is 19770978131. The reversal of 19770978000 is 87907791.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 5572227 + ... + 5575773.

It is an arithmetic number, because the mean of its divisors is an integer number (398926476).

Almost surely, 2^19770978000 is an apocalyptic number.

19770978000 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 19770978000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31914118080).

19770978000 is an abundant number, since it is smaller than the sum of its proper divisors (44057258160).

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

19770978000 is a wasteful number, since it uses less digits than its factorization.

19770978000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502 (or 4486 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 48.

The spelling of 19770978000 in words is "nineteen billion, seven hundred seventy million, nine hundred seventy-eight thousand".