653790 has 64 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 155520.

The previous prime is 653789. The next prime is 653797. The reversal of 653790 is 97356.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17652 + ... + 17688.

It is an arithmetic number, because the mean of its divisors is an integer number (27360).

2⁶⁵³⁷⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 653790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875520).

653790 is an abundant number, since it is smaller than the sum of its proper divisors (1097250).

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

653790 is a wasteful number, since it uses less digits than its factorization.

653790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 653790 is about 808.5728167580. The cubic root of 653790 is about 86.7919457087.

The spelling of 653790 in words is "six hundred fifty-three thousand, seven hundred ninety".