1275763878 has 64 divisors (see below), whose sum is σ = 3009839040. Its totient is φ = 399168000.

The previous prime is 1275763847. The next prime is 1275764029. The reversal of 1275763878 is 8783675721.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384828 + ... + 388128.

It is an arithmetic number, because the mean of its divisors is an integer number (47028735).

Almost surely, 2^1275763878 is an apocalyptic number.

1275763878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1275763878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1504919520).

1275763878 is an abundant number, since it is smaller than the sum of its proper divisors (1734075162).

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

1275763878 is a wasteful number, since it uses less digits than its factorization.

1275763878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750 (or 3744 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 1275763878 is about 35717.8369725828. The cubic root of 1275763878 is about 1084.5679516047.

The spelling of 1275763878 in words is "one billion, two hundred seventy-five million, seven hundred sixty-three thousand, eight hundred seventy-eight".