55997658 has 12 divisors (see below), whose sum is σ = 121328298. Its totient is φ = 18665880.

The previous prime is 55997657. The next prime is 55997659. The reversal of 55997658 is 85679955.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55997657) and next prime (55997659).

It can be written as a sum of positive squares in only one way, i.e., 32114889 + 23882769 = 5667^2 + 4887^2 .

It is not an unprimeable number, because it can be changed into a prime (55997657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1555473 + ... + 1555508.

Almost surely, 2^55997658 is an apocalyptic number.

55997658 is an abundant number, since it is smaller than the sum of its proper divisors (65330640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55997658 is a wasteful number, since it uses less digits than its factorization.

55997658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110989 (or 3110986 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 54.

The square root of 55997658 is about 7483.1582904546. The cubic root of 55997658 is about 382.5809030458.

The spelling of 55997658 in words is "fifty-five million, nine hundred ninety-seven thousand, six hundred fifty-eight".