61218504 has 64 divisors (see below), whose sum is σ = 172200000. Its totient is φ = 20400336.

The previous prime is 61218497. The next prime is 61218511. The reversal of 61218504 is 40581216.

61218504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61218497) and next prime (61218511).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15747 + ... + 19245.

It is an arithmetic number, because the mean of its divisors is an integer number (2690625).

Almost surely, 2^61218504 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 61218504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86100000).

61218504 is an abundant number, since it is smaller than the sum of its proper divisors (110981496).

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

61218504 is an equidigital number, since it uses as much as digits as its factorization.

61218504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526 (or 3504 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61218504 is about 7824.2254568743. The cubic root of 61218504 is about 394.1191802787.

The spelling of 61218504 in words is "sixty-one million, two hundred eighteen thousand, five hundred four".