61699538 has 4 divisors (see below), whose sum is σ = 92549310. Its totient is φ = 30849768.

The previous prime is 61699531. The next prime is 61699541. The reversal of 61699538 is 83599616.

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., 61669609 + 29929 = 7853^2 + 173^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61699492 and 61699501.

It is not an unprimeable number, because it can be changed into a prime (61699531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15424883 + ... + 15424886.

Almost surely, 2^61699538 is an apocalyptic number.

61699538 is a deficient number, since it is larger than the sum of its proper divisors (30849772).

61699538 is a wasteful number, since it uses less digits than its factorization.

61699538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30849771.

The product of its digits is 349920, while the sum is 47.

The square root of 61699538 is about 7854.9053463425. The cubic root of 61699538 is about 395.1487726726.

The spelling of 61699538 in words is "sixty-one million, six hundred ninety-nine thousand, five hundred thirty-eight".