87720853 has 32 divisors (see below), whose sum is σ = 107049600. Its totient is φ = 70963200.

The previous prime is 87720851. The next prime is 87720863. The reversal of 87720853 is 35802778.

It is not a de Polignac number, because 87720853 - 2¹ = 87720851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87720851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248325 + ... + 248677.

It is an arithmetic number, because the mean of its divisors is an integer number (3345300).

Almost surely, 2^87720853 is an apocalyptic number.

It is an amenable number.

87720853 is a deficient number, since it is larger than the sum of its proper divisors (19328747).

87720853 is a wasteful number, since it uses less digits than its factorization.

87720853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 87720853 is about 9365.9411166204. The cubic root of 87720853 is about 444.3252037454.

The spelling of 87720853 in words is "eighty-seven million, seven hundred twenty thousand, eight hundred fifty-three".