720340087 has 8 divisors (see below), whose sum is σ = 763674752. Its totient is φ = 678261600.

The previous prime is 720340069. The next prime is 720340121. The reversal of 720340087 is 780043027.

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 720340087 - 2¹¹ = 720338039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720340037) 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, 312864 + ... + 315157.

It is an arithmetic number, because the mean of its divisors is an integer number (95459344).

Almost surely, 2^720340087 is an apocalyptic number.

720340087 is a deficient number, since it is larger than the sum of its proper divisors (43334665).

720340087 is a wasteful number, since it uses less digits than its factorization.

720340087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628089.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 720340087 is about 26839.1521289328. The cubic root of 720340087 is about 896.4220444594.

The spelling of 720340087 in words is "seven hundred twenty million, three hundred forty thousand, eighty-seven".