105720515 has 16 divisors (see below), whose sum is σ = 132295680. Its totient is φ = 81002880.

The previous prime is 105720499. The next prime is 105720521. The reversal of 105720515 is 515027501.

It is a happy number.

It is not a de Polignac number, because 105720515 - 2⁴ = 105720499 is a prime.

It is a super-2 number, since 2×105720515² = 22353654583730450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15545 + ... + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (8268480).

Almost surely, 2^105720515 is an apocalyptic number.

105720515 is a deficient number, since it is larger than the sum of its proper divisors (26575165).

105720515 is a wasteful number, since it uses less digits than its factorization.

105720515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5902.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 105720515 is about 10282.0481909005. The cubic root of 105720515 is about 472.8460404751.

The spelling of 105720515 in words is "one hundred five million, seven hundred twenty thousand, five hundred fifteen".