87978105454 has 4 divisors (see below), whose sum is σ = 131967158184. Its totient is φ = 43989052726.

The previous prime is 87978105443. The next prime is 87978105463. The reversal of 87978105454 is 45450187978.

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

It is a super-2 number, since 2×87978105454² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21994526362 + ... + 21994526365.

It is an arithmetic number, because the mean of its divisors is an integer number (32991789546).

Almost surely, 2^87978105454 is an apocalyptic number.

87978105454 is a deficient number, since it is larger than the sum of its proper divisors (43989052730).

87978105454 is a wasteful number, since it uses less digits than its factorization.

87978105454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43989052729.

The product of its (nonzero) digits is 11289600, while the sum is 58.

The spelling of 87978105454 in words is "eighty-seven billion, nine hundred seventy-eight million, one hundred five thousand, four hundred fifty-four".