1287618960 has 40 divisors (see below), whose sum is σ = 3991619520. Its totient is φ = 343364992.

The previous prime is 1287618949. The next prime is 1287618971. The reversal of 1287618960 is 698167821.

It is an interprime number because it is at equal distance from previous prime (1287618949) and next prime (1287618971).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2682300 + ... + 2682779.

It is an arithmetic number, because the mean of its divisors is an integer number (99790488).

Almost surely, 2^1287618960 is an apocalyptic number.

1287618960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287618960 is an abundant number, since it is smaller than the sum of its proper divisors (2704000560).

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

1287618960 is a wasteful number, since it uses less digits than its factorization.

1287618960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365095 (or 5365089 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 1287618960 is about 35883.4078649172. The cubic root of 1287618960 is about 1087.9170613320.

The spelling of 1287618960 in words is "one billion, two hundred eighty-seven million, six hundred eighteen thousand, nine hundred sixty".