1277665480 has 128 divisors (see below), whose sum is σ = 3581625600. Its totient is φ = 399393792.

The previous prime is 1277665429. The next prime is 1277665483. The reversal of 1277665480 is 845667721.

It is a happy number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1277665480.

It is not an unprimeable number, because it can be changed into a prime (1277665483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300006 + ... + 304234.

It is an arithmetic number, because the mean of its divisors is an integer number (27981450).

Almost surely, 2^1277665480 is an apocalyptic number.

1277665480 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 1277665480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1790812800).

1277665480 is an abundant number, since it is smaller than the sum of its proper divisors (2303960120).

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

1277665480 is a wasteful number, since it uses less digits than its factorization.

1277665480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4343 (or 4339 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 1277665480 is about 35744.4468414326. The cubic root of 1277665480 is about 1085.1065551166.

The spelling of 1277665480 in words is "one billion, two hundred seventy-seven million, six hundred sixty-five thousand, four hundred eighty".