61891272 has 24 divisors (see below), whose sum is σ = 167622390. Its totient is φ = 20630400.

The previous prime is 61891259. The next prime is 61891301. The reversal of 61891272 is 27219816.

It can be written as a sum of positive squares in only one way, i.e., 56160036 + 5731236 = 7494^2 + 2394^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 429729 + ... + 429872.

Almost surely, 2^61891272 is an apocalyptic number.

It is an amenable number.

61891272 is an abundant number, since it is smaller than the sum of its proper divisors (105731118).

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

61891272 is a wasteful number, since it uses less digits than its factorization.

61891272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859613 (or 859606 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 61891272 is about 7867.1006095003. The cubic root of 61891272 is about 395.5576634198.

The spelling of 61891272 in words is "sixty-one million, eight hundred ninety-one thousand, two hundred seventy-two".