55551428 has 6 divisors (see below), whose sum is σ = 97215006. Its totient is φ = 27775712.

The previous prime is 55551409. The next prime is 55551437. The reversal of 55551428 is 82415555.

It can be written as a sum of positive squares in only one way, i.e., 40043584 + 15507844 = 6328^2 + 3938^2 .

It is a super-2 number, since 2×55551428² = 6171922305678368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6943925 + ... + 6943932.

It is an arithmetic number, because the mean of its divisors is an integer number (16202501).

Almost surely, 2^55551428 is an apocalyptic number.

It is an amenable number.

55551428 is a deficient number, since it is larger than the sum of its proper divisors (41663578).

55551428 is a wasteful number, since it uses less digits than its factorization.

55551428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13887861 (or 13887859 counting only the distinct ones).

The product of its digits is 40000, while the sum is 35.

The square root of 55551428 is about 7453.2830350122. The cubic root of 55551428 is about 381.5619642071.

The spelling of 55551428 in words is "fifty-five million, five hundred fifty-one thousand, four hundred twenty-eight".