61771560 has 64 divisors (see below), whose sum is σ = 193380480. Its totient is φ = 15755520.

The previous prime is 61771559. The next prime is 61771573. The reversal of 61771560 is 6517716.

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, 8431 + ... + 13950.

It is an arithmetic number, because the mean of its divisors is an integer number (3021570).

Almost surely, 2^61771560 is an apocalyptic number.

61771560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61771560 is an abundant number, since it is smaller than the sum of its proper divisors (131608920).

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

61771560 is a wasteful number, since it uses less digits than its factorization.

61771560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22418 (or 22414 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 61771560 is about 7859.4885329772. The cubic root of 61771560 is about 395.3024655496.

The spelling of 61771560 in words is "sixty-one million, seven hundred seventy-one thousand, five hundred sixty".