61421560 has 16 divisors (see below), whose sum is σ = 138198600. Its totient is φ = 24568608.

The previous prime is 61421453. The next prime is 61421573. The reversal of 61421560 is 6512416.

It is a congruent number.

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, 767730 + ... + 767809.

Almost surely, 2^61421560 is an apocalyptic number.

It is an amenable number.

61421560 is an abundant number, since it is smaller than the sum of its proper divisors (76777040).

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

61421560 is a wasteful number, since it uses less digits than its factorization.

61421560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535550 (or 1535546 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 61421560 is about 7837.1908232478. The cubic root of 61421560 is about 394.5544514232.

Adding to 61421560 its reverse (6512416), we get a palindrome (67933976).

The spelling of 61421560 in words is "sixty-one million, four hundred twenty-one thousand, five hundred sixty".