87815909254 has 4 divisors (see below), whose sum is σ = 131723863884. Its totient is φ = 43907954626.

The previous prime is 87815909239. The next prime is 87815909273. The reversal of 87815909254 is 45290951878.

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

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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21953977312 + ... + 21953977315.

It is an arithmetic number, because the mean of its divisors is an integer number (32930965971).

Almost surely, 2^87815909254 is an apocalyptic number.

87815909254 is a deficient number, since it is larger than the sum of its proper divisors (43907954630).

87815909254 is a wasteful number, since it uses less digits than its factorization.

87815909254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43907954629.

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 87815909254 in words is "eighty-seven billion, eight hundred fifteen million, nine hundred nine thousand, two hundred fifty-four".