87308781 has 16 divisors (see below), whose sum is σ = 140044800. Its totient is φ = 47264688.

The previous prime is 87308729. The next prime is 87308783. The reversal of 87308781 is 18780378.

It is not a de Polignac number, because 87308781 - 2⁶ = 87308717 is a prime.

It is a super-2 number, since 2×87308781² = 15245646479411922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87308783) 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, 109011 + ... + 109808.

It is an arithmetic number, because the mean of its divisors is an integer number (8752800).

Almost surely, 2^87308781 is an apocalyptic number.

It is an amenable number.

87308781 is a deficient number, since it is larger than the sum of its proper divisors (52736019).

87308781 is a wasteful number, since it uses less digits than its factorization.

87308781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218848.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 87308781 is about 9343.9167911535. The cubic root of 87308781 is about 443.6283666894.

The spelling of 87308781 in words is "eighty-seven million, three hundred eight thousand, seven hundred eighty-one".