61877945 has 8 divisors (see below), whose sum is σ = 74298120. Its totient is φ = 49472640.

The previous prime is 61877941. The next prime is 61877951. The reversal of 61877945 is 54977816.

It can be written as a sum of positive squares in 4 ways, for example, as 5161984 + 56715961 = 2272^2 + 7531^2 .

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

It is not a de Polignac number, because 61877945 - 2² = 61877941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61877945.

It is not an unprimeable number, because it can be changed into a prime (61877941) 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, 10151 + ... + 15059.

It is an arithmetic number, because the mean of its divisors is an integer number (9287265).

Almost surely, 2^61877945 is an apocalyptic number.

It is an amenable number.

61877945 is a deficient number, since it is larger than the sum of its proper divisors (12420175).

61877945 is a wasteful number, since it uses less digits than its factorization.

61877945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7435.

The product of its digits is 423360, while the sum is 47.

The square root of 61877945 is about 7866.2535555371. The cubic root of 61877945 is about 395.5292696725.

The spelling of 61877945 in words is "sixty-one million, eight hundred seventy-seven thousand, nine hundred forty-five".