61691944 has 16 divisors (see below), whose sum is σ = 115909920. Its totient is φ = 30782640.

The previous prime is 61691941. The next prime is 61691983. The reversal of 61691944 is 44919616.

It is a junction number, because it is equal to n+sod(n) for n = 61691897 and 61691906.

It is not an unprimeable number, because it can be changed into a prime (61691941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3642 + ... + 11689.

It is an arithmetic number, because the mean of its divisors is an integer number (7244370).

Almost surely, 2^61691944 is an apocalyptic number.

It is an amenable number.

61691944 is a deficient number, since it is larger than the sum of its proper divisors (54217976).

61691944 is a wasteful number, since it uses less digits than its factorization.

61691944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15840 (or 15836 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 61691944 is about 7854.4219392645. The cubic root of 61691944 is about 395.1325603259.

The spelling of 61691944 in words is "sixty-one million, six hundred ninety-one thousand, nine hundred forty-four".