55399772 has 6 divisors (see below), whose sum is σ = 96949608. Its totient is φ = 27699884.

The previous prime is 55399739. The next prime is 55399783. The reversal of 55399772 is 27799355.

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, 6924968 + ... + 6924975.

It is an arithmetic number, because the mean of its divisors is an integer number (16158268).

Almost surely, 2^55399772 is an apocalyptic number.

It is an amenable number.

55399772 is a deficient number, since it is larger than the sum of its proper divisors (41549836).

55399772 is a wasteful number, since it uses less digits than its factorization.

55399772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13849947 (or 13849945 counting only the distinct ones).

The product of its digits is 595350, while the sum is 47.

The square root of 55399772 is about 7443.1023101930. The cubic root of 55399772 is about 381.2144249883.

The spelling of 55399772 in words is "fifty-five million, three hundred ninety-nine thousand, seven hundred seventy-two".