1254278655 has 128 divisors (see below), whose sum is σ = 2637619200. Its totient is φ = 553692672.

The previous prime is 1254278639. The next prime is 1254278713. The reversal of 1254278655 is 5568724521.

1254278655 is a nontrivial binomial coefficient, being equal to C(50086, 2).

It is not a de Polignac number, because 1254278655 - 2⁴ = 1254278639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1254278655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3956557 + ... + 3956873.

It is an arithmetic number, because the mean of its divisors is an integer number (20606400).

Almost surely, 2^1254278655 is an apocalyptic number.

1254278655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1254278655 is the 50085-th triangular number and also the 25043-rd hexagonal number.

1254278655 is an abundant number, since it is smaller than the sum of its proper divisors (1383340545).

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

1254278655 is a wasteful number, since it uses less digits than its factorization.

1254278655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 464 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The square root of 1254278655 is about 35415.7966873541. The cubic root of 1254278655 is about 1078.4450230312.

The spelling of 1254278655 in words is "one billion, two hundred fifty-four million, two hundred seventy-eight thousand, six hundred fifty-five".