1019452644 has 108 divisors (see below), whose sum is σ = 3128134464. Its totient is φ = 278597088.

The previous prime is 1019452633. The next prime is 1019452769. The reversal of 1019452644 is 4462549101.

1019452644 is a `hidden beast` number, since 1 + 0 + 1 + 9 + 4 + 5 + 2 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1019452599 and 1019452608.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28009 + ... + 53135.

It is an arithmetic number, because the mean of its divisors is an integer number (28964208).

Almost surely, 2^1019452644 is an apocalyptic number.

1019452644 is a gapful number since it is divisible by the number (14) 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 1019452644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1564067232).

1019452644 is an abundant number, since it is smaller than the sum of its proper divisors (2108681820).

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

1019452644 is a wasteful number, since it uses less digits than its factorization.

1019452644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25174 (or 25162 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1019452644 is about 31928.8685048500. The cubic root of 1019452644 is about 1006.4426181988.

The spelling of 1019452644 in words is "one billion, nineteen million, four hundred fifty-two thousand, six hundred forty-four".