1987679617 has 16 divisors (see below), whose sum is σ = 2524908672. Its totient is φ = 1519614720.

The previous prime is 1987679599. The next prime is 1987679641. The reversal of 1987679617 is 7169767891.

It is a cyclic number.

It is not a de Polignac number, because 1987679617 - 2⁷ = 1987679489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1987679677) 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, 239448 + ... + 247609.

It is an arithmetic number, because the mean of its divisors is an integer number (157806792).

Almost surely, 2^1987679617 is an apocalyptic number.

It is an amenable number.

1987679617 is a deficient number, since it is larger than the sum of its proper divisors (537229055).

1987679617 is a wasteful number, since it uses less digits than its factorization.

1987679617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487128.

The product of its digits is 8001504, while the sum is 61.

The square root of 1987679617 is about 44583.4006890457. The cubic root of 1987679617 is about 1257.3286009437.

The spelling of 1987679617 in words is "one billion, nine hundred eighty-seven million, six hundred seventy-nine thousand, six hundred seventeen".