720707998 has 4 divisors (see below), whose sum is σ = 1081062000. Its totient is φ = 360353998.

The previous prime is 720707983. The next prime is 720708017. The reversal of 720707998 is 899707027.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180176998 + ... + 180177001.

It is an arithmetic number, because the mean of its divisors is an integer number (270265500).

Almost surely, 2^720707998 is an apocalyptic number.

720707998 is a deficient number, since it is larger than the sum of its proper divisors (360354002).

720707998 is a wasteful number, since it uses less digits than its factorization.

720707998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360354001.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 720707998 is about 26846.0052521786. The cubic root of 720707998 is about 896.5746332176.

The spelling of 720707998 in words is "seven hundred twenty million, seven hundred seven thousand, nine hundred ninety-eight".