61772420 has 48 divisors (see below), whose sum is σ = 137592000. Its totient is φ = 23230080.

The previous prime is 61772393. The next prime is 61772449. The reversal of 61772420 is 2427716.

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, 56075 + ... + 57165.

It is an arithmetic number, because the mean of its divisors is an integer number (2866500).

Almost surely, 2^61772420 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 61772420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68796000).

61772420 is an abundant number, since it is smaller than the sum of its proper divisors (75819580).

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

61772420 is a wasteful number, since it uses less digits than its factorization.

61772420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268 (or 1266 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 61772420 is about 7859.5432437261. The cubic root of 61772420 is about 395.3043000429.

It can be divided in two parts, 617 and 72420, that added together give a palindrome (73037).

The spelling of 61772420 in words is "sixty-one million, seven hundred seventy-two thousand, four hundred twenty".