653797780 has 12 divisors (see below), whose sum is σ = 1372975380. Its totient is φ = 261519104.

The previous prime is 653797763. The next prime is 653797783. The reversal of 653797780 is 87797356.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 171819664 + 481978116 = 13108^2 + 21954^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653797783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16344925 + ... + 16344964.

It is an arithmetic number, because the mean of its divisors is an integer number (114414615).

Almost surely, 2^653797780 is an apocalyptic number.

It is an amenable number.

653797780 is an abundant number, since it is smaller than the sum of its proper divisors (719177600).

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

653797780 is a wasteful number, since it uses less digits than its factorization.

653797780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32689898 (or 32689896 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 52.

The square root of 653797780 is about 25569.4696855449. The cubic root of 653797780 is about 867.9228997754.

The spelling of 653797780 in words is "six hundred fifty-three million, seven hundred ninety-seven thousand, seven hundred eighty".