7257720550 has 12 divisors (see below), whose sum is σ = 13499360316. Its totient is φ = 2903088200.

The previous prime is 7257720539. The next prime is 7257720551. The reversal of 7257720550 is 550277527.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7257720551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72577156 + ... + 72577255.

It is an arithmetic number, because the mean of its divisors is an integer number (1124946693).

Almost surely, 2^7257720550 is an apocalyptic number.

7257720550 is a deficient number, since it is larger than the sum of its proper divisors (6241639766).

7257720550 is a wasteful number, since it uses less digits than its factorization.

7257720550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145154423 (or 145154418 counting only the distinct ones).

The product of its (nonzero) digits is 171500, while the sum is 40.

The square root of 7257720550 is about 85192.2563969285. The cubic root of 7257720550 is about 1936.1250949024.

The spelling of 7257720550 in words is "seven billion, two hundred fifty-seven million, seven hundred twenty thousand, five hundred fifty".