87063781 has 4 divisors (see below), whose sum is σ = 99501472. Its totient is φ = 74626092.

The previous prime is 87063773. The next prime is 87063793. The reversal of 87063781 is 18736078.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87063781 - 2³ = 87063773 is a prime.

It is a super-2 number, since 2×87063781² = 15160203924031922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87063761) 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, 6218835 + ... + 6218848.

It is an arithmetic number, because the mean of its divisors is an integer number (24875368).

Almost surely, 2^87063781 is an apocalyptic number.

It is an amenable number.

87063781 is a deficient number, since it is larger than the sum of its proper divisors (12437691).

87063781 is a wasteful number, since it uses less digits than its factorization.

87063781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12437690.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 87063781 is about 9330.7974471639. The cubic root of 87063781 is about 443.2130179598.

The spelling of 87063781 in words is "eighty-seven million, sixty-three thousand, seven hundred eighty-one".