720015157 has 4 divisors (see below), whose sum is σ = 720070956. Its totient is φ = 719959360.

The previous prime is 720015151. The next prime is 720015181. The reversal of 720015157 is 751510027.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 751510027 = 23 ⋅32674349.

It can be written as a sum of positive squares in 2 ways, for example, as 243640881 + 476374276 = 15609^2 + 21826^2 .

It is a cyclic number.

It is not a de Polignac number, because 720015157 - 2⁷ = 720015029 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 (720015151) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2493 + ... + 38029.

It is an arithmetic number, because the mean of its divisors is an integer number (180017739).

Almost surely, 2^720015157 is an apocalyptic number.

It is an amenable number.

720015157 is a deficient number, since it is larger than the sum of its proper divisors (55799).

720015157 is a wasteful number, since it uses less digits than its factorization.

720015157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55798.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 720015157 is about 26833.0981625305. The cubic root of 720015157 is about 896.2872385869.

The spelling of 720015157 in words is "seven hundred twenty million, fifteen thousand, one hundred fifty-seven".