53409720 has 256 divisors, whose sum is σ = 202890240. Its totient is φ = 10948608.

The previous prime is 53409689. The next prime is 53409737. The reversal of 53409720 is 2790435.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 731604 + ... + 731676.

It is an arithmetic number, because the mean of its divisors is an integer number (792540).

Almost surely, 2^53409720 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 53409720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101445120).

53409720 is an abundant number, since it is smaller than the sum of its proper divisors (149480520).

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

53409720 is a wasteful number, since it uses less digits than its factorization.

53409720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 53409720 is about 7308.1953996866. The cubic root of 53409720 is about 376.5940323394.

The spelling of 53409720 in words is "fifty-three million, four hundred nine thousand, seven hundred twenty".