61775420 has 48 divisors (see below), whose sum is σ = 149822400. Its totient is φ = 20957184.

The previous prime is 61775411. The next prime is 61775431. The reversal of 61775420 is 2457716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11306 + ... + 15854.

It is an arithmetic number, because the mean of its divisors is an integer number (3121300).

Almost surely, 2^61775420 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 61775420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74911200).

61775420 is an abundant number, since it is smaller than the sum of its proper divisors (88046980).

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

61775420 is a wasteful number, since it uses less digits than its factorization.

61775420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4662 (or 4660 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 61775420 is about 7859.7340921942. The cubic root of 61775420 is about 395.3106993049.

The spelling of 61775420 in words is "sixty-one million, seven hundred seventy-five thousand, four hundred twenty".