61149420 has 72 divisors (see below), whose sum is σ = 187767216. Its totient is φ = 16106112.

The previous prime is 61149401. The next prime is 61149421. The reversal of 61149420 is 2494116.

61149420 is a `hidden beast` number, since 611 + 4 + 9 + 42 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (61149421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12894 + ... + 16986.

It is an arithmetic number, because the mean of its divisors is an integer number (2607878).

Almost surely, 2^61149420 is an apocalyptic number.

61149420 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 61149420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93883608).

61149420 is an abundant number, since it is smaller than the sum of its proper divisors (126617796).

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

61149420 is a wasteful number, since it uses less digits than its factorization.

61149420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191 (or 4186 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 61149420 is about 7819.8094605943. The cubic root of 61149420 is about 393.9708723002.

The spelling of 61149420 in words is "sixty-one million, one hundred forty-nine thousand, four hundred twenty".