87457811 has 4 divisors (see below), whose sum is σ = 99951792. Its totient is φ = 74963832.

The previous prime is 87457807. The next prime is 87457849. The reversal of 87457811 is 11875478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11875478 = 2 ⋅5937739.

It is a cyclic number.

It is not a de Polignac number, because 87457811 - 2² = 87457807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87457801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6246980 + ... + 6246993.

It is an arithmetic number, because the mean of its divisors is an integer number (24987948).

Almost surely, 2^87457811 is an apocalyptic number.

87457811 is a deficient number, since it is larger than the sum of its proper divisors (12493981).

87457811 is a wasteful number, since it uses less digits than its factorization.

87457811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12493980.

The product of its digits is 62720, while the sum is 41.

The square root of 87457811 is about 9351.8880981329. Note that the first 3 decimals coincide. The cubic root of 87457811 is about 443.8806374350.

It can be divided in two parts, 874 and 57811, that added together give a palindrome (58685).

The spelling of 87457811 in words is "eighty-seven million, four hundred fifty-seven thousand, eight hundred eleven".