1987272878 has 4 divisors (see below), whose sum is σ = 2980909320. Its totient is φ = 993636438.

The previous prime is 1987272877. The next prime is 1987272893. The reversal of 1987272878 is 8782727891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987272877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496818218 + ... + 496818221.

It is an arithmetic number, because the mean of its divisors is an integer number (745227330).

Almost surely, 2^1987272878 is an apocalyptic number.

1987272878 is a deficient number, since it is larger than the sum of its proper divisors (993636442).

1987272878 is an equidigital number, since it uses as much as digits as its factorization.

1987272878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993636441.

The product of its digits is 6322176, while the sum is 59.

The square root of 1987272878 is about 44578.8389036772. The cubic root of 1987272878 is about 1257.2428326840.

The spelling of 1987272878 in words is "one billion, nine hundred eighty-seven million, two hundred seventy-two thousand, eight hundred seventy-eight".