61071020 has 12 divisors (see below), whose sum is σ = 128249184. Its totient is φ = 24428400.

The previous prime is 61071007. The next prime is 61071037. The reversal of 61071020 is 2017016.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61071020.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526756 + ... + 1526795.

It is an arithmetic number, because the mean of its divisors is an integer number (10687432).

Almost surely, 2^61071020 is an apocalyptic number.

It is an amenable number.

61071020 is an abundant number, since it is smaller than the sum of its proper divisors (67178164).

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

61071020 is a wasteful number, since it uses less digits than its factorization.

61071020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053560 (or 3053558 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 61071020 is about 7814.7949429272. The cubic root of 61071020 is about 393.8024295684.

Adding to 61071020 its reverse (2017016), we get a palindrome (63088036).

The spelling of 61071020 in words is "sixty-one million, seventy-one thousand, twenty".