720134778 has 32 divisors (see below), whose sum is σ = 1588870080. Its totient is φ = 215768960.

The previous prime is 720134777. The next prime is 720134791. The reversal of 720134778 is 877431027.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720134777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55425 + ... + 67172.

It is an arithmetic number, because the mean of its divisors is an integer number (49652190).

Almost surely, 2^720134778 is an apocalyptic number.

720134778 is an abundant number, since it is smaller than the sum of its proper divisors (868735302).

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

720134778 is a wasteful number, since it uses less digits than its factorization.

720134778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122702.

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 720134778 is about 26835.3270522273. The cubic root of 720134778 is about 896.3368712638.

The spelling of 720134778 in words is "seven hundred twenty million, one hundred thirty-four thousand, seven hundred seventy-eight".