19064640 has 112 divisors (see below), whose sum is σ = 69201792. Its totient is φ = 4356096.

The previous prime is 19064623. The next prime is 19064641. The reversal of 19064640 is 4646091.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 19064598 and 19064607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19064641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5302 + ... + 8138.

Almost surely, 2^19064640 is an apocalyptic number.

19064640 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 19064640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34600896).

19064640 is an abundant number, since it is smaller than the sum of its proper divisors (50137152).

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

19064640 is a wasteful number, since it uses less digits than its factorization.

19064640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864 (or 2854 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 19064640 is about 4366.3073643526. The cubic root of 19064640 is about 267.1424284632.

The spelling of 19064640 in words is "nineteen million, sixty-four thousand, six hundred forty".