1005657000 has 128 divisors (see below), whose sum is σ = 3169670400. Its totient is φ = 265440000.

The previous prime is 1005656987. The next prime is 1005657011. The reversal of 1005657000 is 7565001.

It is a super-2 number, since 2×1005657000² = 2022692003298000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301341 + ... + 304659.

It is an arithmetic number, because the mean of its divisors is an integer number (24763050).

Almost surely, 2^1005657000 is an apocalyptic number.

1005657000 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 1005657000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1584835200).

1005657000 is an abundant number, since it is smaller than the sum of its proper divisors (2164013400).

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

1005657000 is a wasteful number, since it uses less digits than its factorization.

1005657000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444 (or 3430 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 1005657000 is about 31712.0954842155. The cubic root of 1005657000 is about 1001.8821220608.

The spelling of 1005657000 in words is "one billion, five million, six hundred fifty-seven thousand".