720690034 has 4 divisors (see below), whose sum is σ = 1081035054. Its totient is φ = 360345016.

The previous prime is 720690031. The next prime is 720690037. The reversal of 720690034 is 430096027.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (720690031) and next prime (720690037).

It can be written as a sum of positive squares in only one way, i.e., 446688225 + 274001809 = 21135^2 + 16553^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 720689978 and 720690005.

It is not an unprimeable number, because it can be changed into a prime (720690031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180172507 + ... + 180172510.

Almost surely, 2^720690034 is an apocalyptic number.

720690034 is a deficient number, since it is larger than the sum of its proper divisors (360345020).

720690034 is a wasteful number, since it uses less digits than its factorization.

720690034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360345019.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 720690034 is about 26845.6706751759. The cubic root of 720690034 is about 896.5671839684.

The spelling of 720690034 in words is "seven hundred twenty million, six hundred ninety thousand, thirty-four".