61418520 has 256 divisors, whose sum is σ = 221616000. Its totient is φ = 15095808.

The previous prime is 61418509. The next prime is 61418537. The reversal of 61418520 is 2581416.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1158814 + ... + 1158866.

Almost surely, 2^61418520 is an apocalyptic number.

61418520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61418520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110808000).

61418520 is an abundant number, since it is smaller than the sum of its proper divisors (160197480).

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

61418520 is a wasteful number, since it uses less digits than its factorization.

61418520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 129 counting only the distinct ones).

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

The square root of 61418520 is about 7836.9968738031. The cubic root of 61418520 is about 394.5479419537.

Adding to 61418520 its reverse (2581416), we get a palindrome (63999936).

The spelling of 61418520 in words is "sixty-one million, four hundred eighteen thousand, five hundred twenty".