19687650400 has 288 divisors, whose sum is σ = 55089974016. Its totient is φ = 6800640000.

The previous prime is 19687650373. The next prime is 19687650403. The reversal of 19687650400 is 405678691.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19687650403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42706170 + ... + 42706630.

It is an arithmetic number, because the mean of its divisors is an integer number (191284632).

Almost surely, 2^19687650400 is an apocalyptic number.

19687650400 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 19687650400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27544987008).

19687650400 is an abundant number, since it is smaller than the sum of its proper divisors (35402323616).

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

19687650400 is a wasteful number, since it uses less digits than its factorization.

19687650400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 19687650400 in words is "nineteen billion, six hundred eighty-seven million, six hundred fifty thousand, four hundred".