1987780774 has 8 divisors (see below), whose sum is σ = 3407624208. Its totient is φ = 851906040.

The previous prime is 1987780763. The next prime is 1987780867. The reversal of 1987780774 is 4770877891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70992157 + ... + 70992184.

It is an arithmetic number, because the mean of its divisors is an integer number (425953026).

Almost surely, 2^1987780774 is an apocalyptic number.

1987780774 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1987780774 is a deficient number, since it is larger than the sum of its proper divisors (1419843434).

1987780774 is a wasteful number, since it uses less digits than its factorization.

1987780774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141984350.

The product of its (nonzero) digits is 5531904, while the sum is 58.

The square root of 1987780774 is about 44584.5351439263. The cubic root of 1987780774 is about 1257.3499299061.

The spelling of 1987780774 in words is "one billion, nine hundred eighty-seven million, seven hundred eighty thousand, seven hundred seventy-four".