61287393 has 4 divisors (see below), whose sum is σ = 81716528. Its totient is φ = 40858260.

The previous prime is 61287383. The next prime is 61287409. The reversal of 61287393 is 39378216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61287393 - 2¹⁰ = 61286369 is a prime.

It is a super-2 number, since 2×61287393² = 7512289081472898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61287323) 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, 10214563 + ... + 10214568.

It is an arithmetic number, because the mean of its divisors is an integer number (20429132).

Almost surely, 2^61287393 is an apocalyptic number.

It is an amenable number.

61287393 is a deficient number, since it is larger than the sum of its proper divisors (20429135).

61287393 is a wasteful number, since it uses less digits than its factorization.

61287393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20429134.

The product of its digits is 54432, while the sum is 39.

The square root of 61287393 is about 7828.6265078876. The cubic root of 61287393 is about 394.2669585739.

The spelling of 61287393 in words is "sixty-one million, two hundred eighty-seven thousand, three hundred ninety-three".