56120987 has 4 divisors (see below), whose sum is σ = 60438000. Its totient is φ = 51803976.

The previous prime is 56120969. The next prime is 56120993. The reversal of 56120987 is 78902165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78902165 = 5 ⋅15780433.

It is a cyclic number.

It is not a de Polignac number, because 56120987 - 2¹² = 56116891 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 56120987.

It is not an unprimeable number, because it can be changed into a prime (56120087) 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, 2158487 + ... + 2158512.

It is an arithmetic number, because the mean of its divisors is an integer number (15109500).

Almost surely, 2^56120987 is an apocalyptic number.

56120987 is a deficient number, since it is larger than the sum of its proper divisors (4317013).

56120987 is a wasteful number, since it uses less digits than its factorization.

56120987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317012.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 56120987 is about 7491.3941960092. The cubic root of 56120987 is about 382.8615619484.

The spelling of 56120987 in words is "fifty-six million, one hundred twenty thousand, nine hundred eighty-seven".