720815755 has 12 divisors (see below), whose sum is σ = 950762736. Its totient is φ = 524229200.

The previous prime is 720815737. The next prime is 720815779. The reversal of 720815755 is 557518027.

It is not a de Polignac number, because 720815755 - 2²¹ = 718718603 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 595111 + ... + 596320.

It is an arithmetic number, because the mean of its divisors is an integer number (79230228).

Almost surely, 2^720815755 is an apocalyptic number.

720815755 is a deficient number, since it is larger than the sum of its proper divisors (229946981).

720815755 is a wasteful number, since it uses less digits than its factorization.

720815755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191458 (or 1191447 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 40.

The square root of 720815755 is about 26848.0121238054. The cubic root of 720815755 is about 896.6193149188.

The spelling of 720815755 in words is "seven hundred twenty million, eight hundred fifteen thousand, seven hundred fifty-five".