61538737 has 8 divisors (see below), whose sum is σ = 66352104. Its totient is φ = 56736768.

The previous prime is 61538723. The next prime is 61538767. The reversal of 61538737 is 73783516.

It can be written as a sum of positive squares in 4 ways, for example, as 839056 + 60699681 = 916^2 + 7791^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61538737 - 2¹¹ = 61536689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61538737.

It is not an unprimeable number, because it can be changed into a prime (61538707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10833 + ... + 15505.

It is an arithmetic number, because the mean of its divisors is an integer number (8294013).

Almost surely, 2^61538737 is an apocalyptic number.

It is an amenable number.

61538737 is a deficient number, since it is larger than the sum of its proper divisors (4813367).

61538737 is a wasteful number, since it uses less digits than its factorization.

61538737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699.

The product of its digits is 105840, while the sum is 40.

The square root of 61538737 is about 7844.6629628047. The cubic root of 61538737 is about 394.8051958302.

The spelling of 61538737 in words is "sixty-one million, five hundred thirty-eight thousand, seven hundred thirty-seven".