1287069690 has 48 divisors (see below), whose sum is σ = 3260128608. Its totient is φ = 325151712.

The previous prime is 1287069631. The next prime is 1287069691. The reversal of 1287069690 is 969607821.

It is a super-2 number, since 2×1287069690² = 3313096773833392200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1287069691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48592 + ... + 70251.

It is an arithmetic number, because the mean of its divisors is an integer number (67919346).

Almost surely, 2^1287069690 is an apocalyptic number.

1287069690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287069690 is an abundant number, since it is smaller than the sum of its proper divisors (1973058918).

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

1287069690 is a wasteful number, since it uses less digits than its factorization.

1287069690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118891 (or 118872 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1287069690 is about 35875.7535112505. The cubic root of 1287069690 is about 1087.7623454800.

The spelling of 1287069690 in words is "one billion, two hundred eighty-seven million, sixty-nine thousand, six hundred ninety".