1285020660 has 96 divisors (see below), whose sum is σ = 4485906432. Its totient is φ = 267016320.

The previous prime is 1285020641. The next prime is 1285020661. The reversal of 1285020660 is 660205821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285020661) 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, 134452 + ... + 143691.

It is an arithmetic number, because the mean of its divisors is an integer number (46728192).

Almost surely, 2^1285020660 is an apocalyptic number.

1285020660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285020660 is an abundant number, since it is smaller than the sum of its proper divisors (3200885772).

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

1285020660 is a wasteful number, since it uses less digits than its factorization.

1285020660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278173 (or 278171 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1285020660 is about 35847.1848267057. The cubic root of 1285020660 is about 1087.1847954239.

The spelling of 1285020660 in words is "one billion, two hundred eighty-five million, twenty thousand, six hundred sixty".