61764137 has 4 divisors (see below), whose sum is σ = 63433476. Its totient is φ = 60094800.

The previous prime is 61764127. The next prime is 61764139. The reversal of 61764137 is 73146716.

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 55190041 + 6574096 = 7429^2 + 2564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61764137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61764097 and 61764106.

It is not an unprimeable number, because it can be changed into a prime (61764139) 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, 834614 + ... + 834687.

It is an arithmetic number, because the mean of its divisors is an integer number (15858369).

Almost surely, 2^61764137 is an apocalyptic number.

It is an amenable number.

61764137 is a deficient number, since it is larger than the sum of its proper divisors (1669339).

61764137 is a wasteful number, since it uses less digits than its factorization.

61764137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669338.

The product of its digits is 21168, while the sum is 35.

The square root of 61764137 is about 7859.0162870425. The cubic root of 61764137 is about 395.2866306047.

The spelling of 61764137 in words is "sixty-one million, seven hundred sixty-four thousand, one hundred thirty-seven".