61387538 has 4 divisors (see below), whose sum is σ = 92081310. Its totient is φ = 30693768.

The previous prime is 61387507. The next prime is 61387549. The reversal of 61387538 is 83578316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61042969 + 344569 = 7813^2 + 587^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61387495 and 61387504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15346883 + ... + 15346886.

Almost surely, 2^61387538 is an apocalyptic number.

61387538 is a deficient number, since it is larger than the sum of its proper divisors (30693772).

61387538 is a wasteful number, since it uses less digits than its factorization.

61387538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30693771.

The product of its digits is 120960, while the sum is 41.

The square root of 61387538 is about 7835.0199744481. The cubic root of 61387538 is about 394.4815887846.

The spelling of 61387538 in words is "sixty-one million, three hundred eighty-seven thousand, five hundred thirty-eight".