747720 has 96 divisors (see below), whose sum is σ = 2545920. Its totient is φ = 190080.

The previous prime is 747713. The next prime is 747731. The reversal of 747720 is 27747.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is an unprimeable number.

747720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11127 + ... + 11193.

It is an arithmetic number, because the mean of its divisors is an integer number (26520).

2⁷⁴⁷⁷²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 747720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272960).

747720 is an abundant number, since it is smaller than the sum of its proper divisors (1798200).

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

747720 is a wasteful number, since it uses less digits than its factorization.

747720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 747720 is about 864.7080432146. The cubic root of 747720 is about 90.7638687453.

Adding to 747720 its sum of digits (27), we get a palindrome (747747).

The spelling of 747720 in words is "seven hundred forty-seven thousand, seven hundred twenty", and thus it is an iban number.