61787913 has 32 divisors (see below), whose sum is σ = 94666752. Its totient is φ = 35481600.

The previous prime is 61787909. The next prime is 61787941. The reversal of 61787913 is 31978716.

It is not a de Polignac number, because 61787913 - 2² = 61787909 is a prime.

It is a super-4 number, since 4×61787913⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (61787903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96073 + ... + 96713.

It is an arithmetic number, because the mean of its divisors is an integer number (2958336).

Almost surely, 2^61787913 is an apocalyptic number.

It is an amenable number.

61787913 is a deficient number, since it is larger than the sum of its proper divisors (32878839).

61787913 is a wasteful number, since it uses less digits than its factorization.

61787913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805.

The product of its digits is 63504, while the sum is 42.

The square root of 61787913 is about 7860.5287990058. The cubic root of 61787913 is about 395.3373457375.

The spelling of 61787913 in words is "sixty-one million, seven hundred eighty-seven thousand, nine hundred thirteen".