1012171680 has 384 divisors, whose sum is σ = 3886444800. Its totient is φ = 244518912.

The previous prime is 1012171679. The next prime is 1012171733. The reversal of 1012171680 is 861712101.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3762586 + ... + 3762854.

It is an arithmetic number, because the mean of its divisors is an integer number (10120950).

Almost surely, 2^1012171680 is an apocalyptic number.

1012171680 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 1012171680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1943222400).

1012171680 is an abundant number, since it is smaller than the sum of its proper divisors (2874273120).

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

1012171680 is a wasteful number, since it uses less digits than its factorization.

1012171680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 1012171680 is about 31814.6456840242. The cubic root of 1012171680 is about 1004.0408759938.

Adding to 1012171680 its reverse (861712101), we get a palindrome (1873883781).

The spelling of 1012171680 in words is "one billion, twelve million, one hundred seventy-one thousand, six hundred eighty".