61272045 has 20 divisors (see below), whose sum is σ = 109836540. Its totient is φ = 32678208.

The previous prime is 61272019. The next prime is 61272049. The reversal of 61272045 is 54027216.

61272045 is a `hidden beast` number, since 612 + 7 + 2 + 0 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 37124649 + 24147396 = 6093^2 + 4914^2 .

It is not a de Polignac number, because 61272045 - 2⁹ = 61271533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61272049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75240 + ... + 76049.

It is an arithmetic number, because the mean of its divisors is an integer number (5491827).

Almost surely, 2^61272045 is an apocalyptic number.

It is an amenable number.

61272045 is a deficient number, since it is larger than the sum of its proper divisors (48564495).

61272045 is a wasteful number, since it uses less digits than its factorization.

61272045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151306 (or 151297 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 61272045 is about 7827.6461979320. The cubic root of 61272045 is about 394.2340441675.

The spelling of 61272045 in words is "sixty-one million, two hundred seventy-two thousand, forty-five".