987764137 has 4 divisors (see below), whose sum is σ = 1010735440. Its totient is φ = 964792836.

The previous prime is 987764131. The next prime is 987764149. The reversal of 987764137 is 731467789.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 987764137 - 2¹¹ = 987762089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987764131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11485587 + ... + 11485672.

It is an arithmetic number, because the mean of its divisors is an integer number (252683860).

Almost surely, 2^987764137 is an apocalyptic number.

It is an amenable number.

987764137 is a deficient number, since it is larger than the sum of its proper divisors (22971303).

987764137 is a wasteful number, since it uses less digits than its factorization.

987764137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22971302.

The product of its digits is 1778112, while the sum is 52.

The square root of 987764137 is about 31428.7151662298. The cubic root of 987764137 is about 995.9046298392.

The spelling of 987764137 in words is "nine hundred eighty-seven million, seven hundred sixty-four thousand, one hundred thirty-seven".