87220013 has 8 divisors (see below), whose sum is σ = 97211520. Its totient is φ = 77768640.

The previous prime is 87220009. The next prime is 87220037. The reversal of 87220013 is 31002278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87220013 - 2² = 87220009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87220513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134693 + ... + 135338.

It is an arithmetic number, because the mean of its divisors is an integer number (12151440).

Almost surely, 2^87220013 is an apocalyptic number.

It is an amenable number.

87220013 is a deficient number, since it is larger than the sum of its proper divisors (9991507).

87220013 is a wasteful number, since it uses less digits than its factorization.

87220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270067.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 87220013 is about 9339.1655408821. The cubic root of 87220013 is about 443.4779680850.

The spelling of 87220013 in words is "eighty-seven million, two hundred twenty thousand, thirteen".