720778720 has 48 divisors (see below), whose sum is σ = 1706851440. Its totient is φ = 287632384.

The previous prime is 720778717. The next prime is 720778727. The reversal of 720778720 is 27877027.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720778727) 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, 65796 + ... + 75964.

It is an arithmetic number, because the mean of its divisors is an integer number (35559405).

Almost surely, 2^720778720 is an apocalyptic number.

It is an amenable number.

720778720 is an abundant number, since it is smaller than the sum of its proper divisors (986072720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720778720 is a wasteful number, since it uses less digits than its factorization.

720778720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10627 (or 10619 counting only the distinct ones).

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 720778720 is about 26847.3223990773. The cubic root of 720778720 is about 896.6039587685.

The spelling of 720778720 in words is "seven hundred twenty million, seven hundred seventy-eight thousand, seven hundred twenty".