1012661580 has 96 divisors (see below), whose sum is σ = 3277048320. Its totient is φ = 228856320.

The previous prime is 1012661539. The next prime is 1012661581. The reversal of 1012661580 is 851662101.

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

It is not an unprimeable number, because it can be changed into a prime (1012661581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23835 + ... + 50925.

It is an arithmetic number, because the mean of its divisors is an integer number (34135920).

Almost surely, 2^1012661580 is an apocalyptic number.

1012661580 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 1012661580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1638524160).

1012661580 is an abundant number, since it is smaller than the sum of its proper divisors (2264386740).

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

1012661580 is a wasteful number, since it uses less digits than its factorization.

1012661580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27199 (or 27197 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 1012661580 is about 31822.3440368556. The cubic root of 1012661580 is about 1004.2028380727.

The spelling of 1012661580 in words is "one billion, twelve million, six hundred sixty-one thousand, five hundred eighty".