55277207 has 4 divisors (see below), whose sum is σ = 55298880. Its totient is φ = 55255536.

The previous prime is 55277197. The next prime is 55277221. The reversal of 55277207 is 70277255.

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

It is a cyclic number.

It is not a de Polignac number, because 55277207 - 2¹² = 55273111 is a prime.

It is a super-2 number, since 2×55277207² = 6111139227441698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55270207) 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, 6407 + ... + 12312.

It is an arithmetic number, because the mean of its divisors is an integer number (13824720).

Almost surely, 2^55277207 is an apocalyptic number.

55277207 is a deficient number, since it is larger than the sum of its proper divisors (21673).

55277207 is a wasteful number, since it uses less digits than its factorization.

55277207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21672.

The product of its (nonzero) digits is 34300, while the sum is 35.

The square root of 55277207 is about 7434.8642892793. The cubic root of 55277207 is about 380.9330878193.

The spelling of 55277207 in words is "fifty-five million, two hundred seventy-seven thousand, two hundred seven".