61871972 has 12 divisors (see below), whose sum is σ = 108408300. Its totient is φ = 30898176.

The previous prime is 61871947. The next prime is 61871977. The reversal of 61871972 is 27917816.

It can be written as a sum of positive squares in 2 ways, for example, as 55591936 + 6280036 = 7456^2 + 2506^2 .

It is not an unprimeable number, because it can be changed into a prime (61871977) 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, 5597 + ... + 12452.

It is an arithmetic number, because the mean of its divisors is an integer number (9034025).

Almost surely, 2^61871972 is an apocalyptic number.

It is an amenable number.

61871972 is a deficient number, since it is larger than the sum of its proper divisors (46536328).

61871972 is a wasteful number, since it uses less digits than its factorization.

61871972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18910 (or 18908 counting only the distinct ones).

The product of its digits is 42336, while the sum is 41.

The square root of 61871972 is about 7865.8738866066. The cubic root of 61871972 is about 395.5165426158.

The spelling of 61871972 in words is "sixty-one million, eight hundred seventy-one thousand, nine hundred seventy-two".