55779830 has 16 divisors (see below), whose sum is σ = 104769504. Its totient is φ = 21341760.

The previous prime is 55779827. The next prime is 55779833. The reversal of 55779830 is 3897755.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55779827) and next prime (55779833).

It is a super-2 number, since 2×55779830² = 6222778869657800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55779833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121031 + ... + 121490.

It is an arithmetic number, because the mean of its divisors is an integer number (6548094).

Almost surely, 2^55779830 is an apocalyptic number.

55779830 is a deficient number, since it is larger than the sum of its proper divisors (48989674).

55779830 is a wasteful number, since it uses less digits than its factorization.

55779830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242551.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 55779830 is about 7468.5895589462. The cubic root of 55779830 is about 382.0841850953.

The spelling of 55779830 in words is "fifty-five million, seven hundred seventy-nine thousand, eight hundred thirty".