2691278487 has 16 divisors (see below), whose sum is σ = 3996844000. Its totient is φ = 1789791552.

The previous prime is 2691278419. The next prime is 2691278519. The reversal of 2691278487 is 7848721962.

It is a happy number.

2691278487 is a `hidden beast` number, since 2 + 6 + 91 + 2 + 78 + 487 = 666.

It is not a de Polignac number, because 2691278487 - 2¹⁴ = 2691262103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691278407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110812 + ... + 132897.

It is an arithmetic number, because the mean of its divisors is an integer number (249802750).

Almost surely, 2^2691278487 is an apocalyptic number.

2691278487 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2691278487 is a deficient number, since it is larger than the sum of its proper divisors (1305565513).

2691278487 is a wasteful number, since it uses less digits than its factorization.

2691278487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244127 (or 244121 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 2691278487 is about 51877.5335477700. The cubic root of 2691278487 is about 1390.9757114328.

The spelling of 2691278487 in words is "two billion, six hundred ninety-one million, two hundred seventy-eight thousand, four hundred eighty-seven".