61749270 has 128 divisors (see below), whose sum is σ = 190356480. Its totient is φ = 14077440.

The previous prime is 61749269. The next prime is 61749271. The reversal of 61749270 is 7294716.

It is a happy number.

61749270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61749269) and next prime (61749271).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61749271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49879 + ... + 51101.

It is an arithmetic number, because the mean of its divisors is an integer number (1487160).

Almost surely, 2^61749270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61749270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95178240).

61749270 is an abundant number, since it is smaller than the sum of its proper divisors (128607210).

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

61749270 is a wasteful number, since it uses less digits than its factorization.

61749270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267 (or 1261 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 61749270 is about 7858.0703738259. The cubic root of 61749270 is about 395.2549121015.

The spelling of 61749270 in words is "sixty-one million, seven hundred forty-nine thousand, two hundred seventy".