61538506 has 8 divisors (see below), whose sum is σ = 92347524. Its totient is φ = 30756000.

The previous prime is 61538479. The next prime is 61538507. The reversal of 61538506 is 60583516.

It can be written as a sum of positive squares in 2 ways, for example, as 59151481 + 2387025 = 7691^2 + 1545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (61538507) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 876 + ... + 11128.

Almost surely, 2^61538506 is an apocalyptic number.

61538506 is a deficient number, since it is larger than the sum of its proper divisors (30809018).

61538506 is a wasteful number, since it uses less digits than its factorization.

61538506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13256.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 61538506 is about 7844.6482394050. The cubic root of 61538506 is about 394.8047018318.

The spelling of 61538506 in words is "sixty-one million, five hundred thirty-eight thousand, five hundred six".