87793281 has 32 divisors (see below), whose sum is σ = 139536000. Its totient is φ = 54385344.

The previous prime is 87793273. The next prime is 87793289. The reversal of 87793281 is 18239778.

It is an interprime number because it is at equal distance from previous prime (87793273) and next prime (87793289).

It is not a de Polignac number, because 87793281 - 2³ = 87793273 is a prime.

It is a super-2 number, since 2×87793281² = 15415320377489922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87793289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25575 + ... + 28803.

It is an arithmetic number, because the mean of its divisors is an integer number (4360500).

Almost surely, 2^87793281 is an apocalyptic number.

It is an amenable number.

87793281 is a deficient number, since it is larger than the sum of its proper divisors (51742719).

87793281 is a wasteful number, since it uses less digits than its factorization.

87793281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310 (or 3304 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 87793281 is about 9369.8068816812. The cubic root of 87793281 is about 444.4474579634.

The spelling of 87793281 in words is "eighty-seven million, seven hundred ninety-three thousand, two hundred eighty-one".