61871020 has 24 divisors (see below), whose sum is σ = 131392800. Its totient is φ = 24469632.

The previous prime is 61870987. The next prime is 61871021. The reversal of 61871020 is 2017816.

It is not an unprimeable number, because it can be changed into a prime (61871021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15600 + ... + 19159.

It is an arithmetic number, because the mean of its divisors is an integer number (5474700).

Almost surely, 2^61871020 is an apocalyptic number.

It is an amenable number.

61871020 is an abundant number, since it is smaller than the sum of its proper divisors (69521780).

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

61871020 is a wasteful number, since it uses less digits than its factorization.

61871020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34857 (or 34855 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 61871020 is about 7865.8133718008. The cubic root of 61871020 is about 395.5145140523.

Adding to 61871020 its reverse (2017816), we get a palindrome (63888836).

The spelling of 61871020 in words is "sixty-one million, eight hundred seventy-one thousand, twenty".