61539228 has 36 divisors (see below), whose sum is σ = 157313520. Its totient is φ = 20281536.

The previous prime is 61539227. The next prime is 61539229. The reversal of 61539228 is 82293516.

61539228 is a `hidden beast` number, since 615 + 39 + 2 + 2 + 8 = 666.

61539228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61539227) and next prime (61539229).

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 61539192 and 61539201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6400 + ... + 12807.

It is an arithmetic number, because the mean of its divisors is an integer number (4369820).

Almost surely, 2^61539228 is an apocalyptic number.

It is an amenable number.

61539228 is an abundant number, since it is smaller than the sum of its proper divisors (95774292).

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

61539228 is a wasteful number, since it uses less digits than its factorization.

61539228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19306 (or 19301 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 61539228 is about 7844.6942579045. The cubic root of 61539228 is about 394.8062458400.

The spelling of 61539228 in words is "sixty-one million, five hundred thirty-nine thousand, two hundred twenty-eight".