61471520 has 96 divisors (see below), whose sum is σ = 161663040. Its totient is φ = 21898240.

The previous prime is 61471513. The next prime is 61471537. The reversal of 61471520 is 2517416.

It is a super-2 number, since 2×61471520² = 7557495542220800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61471520.

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, 92951 + ... + 93609.

It is an arithmetic number, because the mean of its divisors is an integer number (1683990).

Almost surely, 2^61471520 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 61471520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80831520).

61471520 is an abundant number, since it is smaller than the sum of its proper divisors (100191520).

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

61471520 is a wasteful number, since it uses less digits than its factorization.

61471520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 61471520 is about 7840.3775419300. The cubic root of 61471520 is about 394.6613986595.

Adding to 61471520 its reverse (2517416), we get a palindrome (63988936).

It can be divided in two parts, 6147 and 1520, that added together give a palindrome (7667).

The spelling of 61471520 in words is "sixty-one million, four hundred seventy-one thousand, five hundred twenty".