87801971 has 16 divisors (see below), whose sum is σ = 94348800. Its totient is φ = 81521088.

The previous prime is 87801949. The next prime is 87801979. The reversal of 87801971 is 17910878.

It is a cyclic number.

It is not a de Polignac number, because 87801971 - 2¹⁸ = 87539827 is a prime.

It is a super-2 number, since 2×87801971² = 15418372222969682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87801979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120410 + ... + 121136.

It is an arithmetic number, because the mean of its divisors is an integer number (5896800).

Almost surely, 2^87801971 is an apocalyptic number.

87801971 is a deficient number, since it is larger than the sum of its proper divisors (6546829).

87801971 is a wasteful number, since it uses less digits than its factorization.

87801971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 87801971 is about 9370.2705937449. The cubic root of 87801971 is about 444.4621216557.

The spelling of 87801971 in words is "eighty-seven million, eight hundred one thousand, nine hundred seventy-one".