87620121 has 12 divisors (see below), whose sum is σ = 128452272. Its totient is φ = 57541176.

The previous prime is 87620119. The next prime is 87620123. The reversal of 87620121 is 12102678.

It is an interprime number because it is at equal distance from previous prime (87620119) and next prime (87620123).

It is not a de Polignac number, because 87620121 - 2¹ = 87620119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87620123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72051 + ... + 73256.

It is an arithmetic number, because the mean of its divisors is an integer number (10704356).

Almost surely, 2^87620121 is an apocalyptic number.

It is an amenable number.

87620121 is a deficient number, since it is larger than the sum of its proper divisors (40832151).

87620121 is a wasteful number, since it uses less digits than its factorization.

87620121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145380 (or 145377 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 87620121 is about 9360.5620023586. The cubic root of 87620121 is about 444.1550621049.

Adding to 87620121 its reverse (12102678), we get a palindrome (99722799).

The spelling of 87620121 in words is "eighty-seven million, six hundred twenty thousand, one hundred twenty-one".