653778 has 16 divisors (see below), whose sum is σ = 1452960. Its totient is φ = 217908.

The previous prime is 653777. The next prime is 653789. The reversal of 653778 is 877356.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (653777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6000 + ... + 6107.

It is an arithmetic number, because the mean of its divisors is an integer number (90810).

2⁶⁵³⁷⁷⁸ is an apocalyptic number.

653778 is an abundant number, since it is smaller than the sum of its proper divisors (799182).

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

653778 is a wasteful number, since it uses less digits than its factorization.

653778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12118 (or 12112 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 653778 is about 808.5653962420. The cubic root of 653778 is about 86.7914146973.

It can be divided in two parts, 653 and 778, that added together give a triangular number (1431 = T₅₃).

The spelling of 653778 in words is "six hundred fifty-three thousand, seven hundred seventy-eight".