55782387 has 12 divisors (see below), whose sum is σ = 80713984. Its totient is φ = 37123920.

The previous prime is 55782371. The next prime is 55782403. The reversal of 55782387 is 78328755.

It is an interprime number because it is at equal distance from previous prime (55782371) and next prime (55782403).

It is not a de Polignac number, because 55782387 - 2⁴ = 55782371 is a prime.

It is a super-2 number, since 2×55782387² = 6223349398835538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55782367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 462 + ... + 10572.

Almost surely, 2^55782387 is an apocalyptic number.

55782387 is a deficient number, since it is larger than the sum of its proper divisors (24931597).

55782387 is a wasteful number, since it uses less digits than its factorization.

55782387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10730 (or 10727 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 55782387 is about 7468.7607405781. The cubic root of 55782387 is about 382.0900233726.

It can be divided in two parts, 55782 and 387, that added together give a square (56169 = 237²).

The spelling of 55782387 in words is "fifty-five million, seven hundred eighty-two thousand, three hundred eighty-seven".