61239287 has 8 divisors (see below), whose sum is σ = 65092896. Its totient is φ = 57413632.

The previous prime is 61239257. The next prime is 61239293. The reversal of 61239287 is 78293216.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61239287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61239287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61239257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2378 + ... + 11319.

It is an arithmetic number, because the mean of its divisors is an integer number (8136612).

Almost surely, 2^61239287 is an apocalyptic number.

61239287 is a deficient number, since it is larger than the sum of its proper divisors (3853609).

61239287 is a wasteful number, since it uses less digits than its factorization.

61239287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13977.

The product of its digits is 36288, while the sum is 38.

The square root of 61239287 is about 7825.5534628549. The cubic root of 61239287 is about 394.1637749228.

The spelling of 61239287 in words is "sixty-one million, two hundred thirty-nine thousand, two hundred eighty-seven".