987892280405 has 4 divisors (see below), whose sum is σ = 1185470736492. Its totient is φ = 790313824320.

The previous prime is 987892280359. The next prime is 987892280423. The reversal of 987892280405 is 504082298789.

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

It can be written as a sum of positive squares in 2 ways, for example, as 383320718641 + 604571561764 = 619129^2 + 777542^2 .

It is not a de Polignac number, because 987892280405 - 2¹² = 987892276309 is a prime.

It is a super-2 number, since 2×987892280405² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

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, 98789228036 + ... + 98789228045.

It is an arithmetic number, because the mean of its divisors is an integer number (296367684123).

Almost surely, 2^987892280405 is an apocalyptic number.

It is an amenable number.

987892280405 is a deficient number, since it is larger than the sum of its proper divisors (197578456087).

987892280405 is a wasteful number, since it uses less digits than its factorization.

987892280405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197578456086.

The product of its (nonzero) digits is 23224320, while the sum is 62.

The spelling of 987892280405 in words is "nine hundred eighty-seven billion, eight hundred ninety-two million, two hundred eighty thousand, four hundred five".