61771944 has 64 divisors (see below), whose sum is σ = 170835840. Its totient is φ = 18489600.

The previous prime is 61771939. The next prime is 61771979. The reversal of 61771944 is 44917716.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 8869 + ... + 14219.

It is an arithmetic number, because the mean of its divisors is an integer number (2669310).

Almost surely, 2^61771944 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 61771944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85417920).

61771944 is an abundant number, since it is smaller than the sum of its proper divisors (109063896).

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

61771944 is a wasteful number, since it uses less digits than its factorization.

61771944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5410 (or 5406 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 61771944 is about 7859.5129620098. The cubic root of 61771944 is about 395.3032846743.

The spelling of 61771944 in words is "sixty-one million, seven hundred seventy-one thousand, nine hundred forty-four".