61287275 has 12 divisors (see below), whose sum is σ = 86853072. Its totient is φ = 42025440.

The previous prime is 61287263. The next prime is 61287287. The reversal of 61287275 is 57278216.

It is an interprime number because it is at equal distance from previous prime (61287263) and next prime (61287287).

It is not a de Polignac number, because 61287275 - 2²⁰ = 60238699 is a prime.

It is a super-2 number, since 2×61287275² = 7512260153851250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174932 + ... + 175281.

It is an arithmetic number, because the mean of its divisors is an integer number (7237756).

Almost surely, 2^61287275 is an apocalyptic number.

61287275 is a deficient number, since it is larger than the sum of its proper divisors (25565797).

61287275 is a wasteful number, since it uses less digits than its factorization.

61287275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350230 (or 350225 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 61287275 is about 7828.6189714406. The cubic root of 61287275 is about 394.2667055391.

The spelling of 61287275 in words is "sixty-one million, two hundred eighty-seven thousand, two hundred seventy-five".