987404928 has 64 divisors (see below), whose sum is σ = 2628637920. Its totient is φ = 328401920.

The previous prime is 987404923. The next prime is 987404933. The reversal of 987404928 is 829404789.

It is a Cunningham number, because it is equal to 31423²-1.

It is an interprime number because it is at equal distance from previous prime (987404923) and next prime (987404933).

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-4 number, since 4×987404928⁴ (a number of 37 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (987404921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185926 + ... + 191162.

Almost surely, 2^987404928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 987404928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1314318960).

987404928 is an abundant number, since it is smaller than the sum of its proper divisors (1641232992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

987404928 is a wasteful number, since it uses less digits than its factorization.

987404928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5745 (or 5733 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 987404928 is about 31422.9999840881. Note that the first 4 decimals coincide. The cubic root of 987404928 is about 995.7838920819.

The spelling of 987404928 in words is "nine hundred eighty-seven million, four hundred four thousand, nine hundred twenty-eight".