61115420 has 24 divisors (see below), whose sum is σ = 131474448. Its totient is φ = 23849600.

The previous prime is 61115389. The next prime is 61115423. The reversal of 61115420 is 2451116.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 61115392 and 61115401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61115423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 36446 + ... + 38085.

It is an arithmetic number, because the mean of its divisors is an integer number (5478102).

Almost surely, 2^61115420 is an apocalyptic number.

It is an amenable number.

61115420 is an abundant number, since it is smaller than the sum of its proper divisors (70359028).

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

61115420 is a wasteful number, since it uses less digits than its factorization.

61115420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74581 (or 74579 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 61115420 is about 7817.6351923072. The cubic root of 61115420 is about 393.8978408469.

Adding to 61115420 its reverse (2451116), we get a palindrome (63566536).

The spelling of 61115420 in words is "sixty-one million, one hundred fifteen thousand, four hundred twenty".