61643274 has 80 divisors (see below), whose sum is σ = 157304160. Its totient is φ = 15970080.

The previous prime is 61643191. The next prime is 61643297. The reversal of 61643274 is 47234616.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 158272 + ... + 158660.

It is an arithmetic number, because the mean of its divisors is an integer number (1966302).

Almost surely, 2^61643274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61643274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78652080).

61643274 is an abundant number, since it is smaller than the sum of its proper divisors (95660886).

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

61643274 is a wasteful number, since it uses less digits than its factorization.

61643274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 412 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 61643274 is about 7851.3230732151. The cubic root of 61643274 is about 395.0286236802.

The spelling of 61643274 in words is "sixty-one million, six hundred forty-three thousand, two hundred seventy-four".