87990404397 has 32 divisors (see below), whose sum is σ = 142291353600. Its totient is φ = 47214690048.

The previous prime is 87990404353. The next prime is 87990404417. The reversal of 87990404397 is 79340409978.

It is a happy number.

It is not a de Polignac number, because 87990404397 - 2¹⁰ = 87990403373 is a prime.

It is a super-2 number, since 2×87990404397² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87990404397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87990402397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123997 + ... + 437442.

It is an arithmetic number, because the mean of its divisors is an integer number (4446604800).

Almost surely, 2^87990404397 is an apocalyptic number.

It is an amenable number.

87990404397 is a deficient number, since it is larger than the sum of its proper divisors (54300949203).

87990404397 is a wasteful number, since it uses less digits than its factorization.

87990404397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561905.

The product of its (nonzero) digits is 13716864, while the sum is 60.

The spelling of 87990404397 in words is "eighty-seven billion, nine hundred ninety million, four hundred four thousand, three hundred ninety-seven".