61191564 has 24 divisors (see below), whose sum is σ = 163177728. Its totient is φ = 17483280.

The previous prime is 61191511. The next prime is 61191589. The reversal of 61191564 is 46519116.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364152 + ... + 364319.

It is an arithmetic number, because the mean of its divisors is an integer number (6799072).

Almost surely, 2^61191564 is an apocalyptic number.

It is an amenable number.

61191564 is an abundant number, since it is smaller than the sum of its proper divisors (101986164).

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

61191564 is a wasteful number, since it uses less digits than its factorization.

61191564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728485 (or 728483 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 61191564 is about 7822.5036912743. The cubic root of 61191564 is about 394.0613593702.

The spelling of 61191564 in words is "sixty-one million, one hundred ninety-one thousand, five hundred sixty-four".