55772215 has 4 divisors (see below), whose sum is σ = 66926664. Its totient is φ = 44617768.

The previous prime is 55772203. The next prime is 55772237. The reversal of 55772215 is 51227755.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55772215 is a prime.

It is a super-2 number, since 2×55772215² = 6221079932012450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5577217 + ... + 5577226.

It is an arithmetic number, because the mean of its divisors is an integer number (16731666).

Almost surely, 2^55772215 is an apocalyptic number.

55772215 is a deficient number, since it is larger than the sum of its proper divisors (11154449).

55772215 is a wasteful number, since it uses less digits than its factorization.

55772215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11154448.

The product of its digits is 24500, while the sum is 34.

The square root of 55772215 is about 7468.0797397992. The cubic root of 55772215 is about 382.0667970688.

The spelling of 55772215 in words is "fifty-five million, seven hundred seventy-two thousand, two hundred fifteen".