61738993 has 4 divisors (see below), whose sum is σ = 61756020. Its totient is φ = 61721968.

The previous prime is 61738979. The next prime is 61739003. The reversal of 61738993 is 39983716.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24137569 + 37601424 = 4913^2 + 6132^2 .

It is a cyclic number.

It is not a de Polignac number, because 61738993 - 2¹⁷ = 61607921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61730993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658 + ... + 11131.

It is an arithmetic number, because the mean of its divisors is an integer number (15439005).

Almost surely, 2^61738993 is an apocalyptic number.

It is an amenable number.

61738993 is a deficient number, since it is larger than the sum of its proper divisors (17027).

61738993 is a wasteful number, since it uses less digits than its factorization.

61738993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17026.

The product of its digits is 244944, while the sum is 46.

The square root of 61738993 is about 7857.4164328996. The cubic root of 61738993 is about 395.2329833127.

The spelling of 61738993 in words is "sixty-one million, seven hundred thirty-eight thousand, nine hundred ninety-three".