55781038 has 4 divisors (see below), whose sum is σ = 83671560. Its totient is φ = 27890518.

The previous prime is 55781009. The next prime is 55781071. The reversal of 55781038 is 83018755.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×55781038² = 6223048400714888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55780988 and 55781006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945258 + ... + 13945261.

It is an arithmetic number, because the mean of its divisors is an integer number (20917890).

Almost surely, 2^55781038 is an apocalyptic number.

55781038 is a deficient number, since it is larger than the sum of its proper divisors (27890522).

55781038 is a wasteful number, since it uses less digits than its factorization.

55781038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27890521.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 55781038 is about 7468.6704305385. The cubic root of 55781038 is about 382.0869432869.

The spelling of 55781038 in words is "fifty-five million, seven hundred eighty-one thousand, thirty-eight".