55797690 has 64 divisors (see below), whose sum is σ = 145224576. Its totient is φ = 13638912.

The previous prime is 55797683. The next prime is 55797697. The reversal of 55797690 is 9679755.

It is an interprime number because it is at equal distance from previous prime (55797683) and next prime (55797697).

It is a super-2 number, since 2×55797690² = 6226764418672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55797697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67057 + ... + 67883.

It is an arithmetic number, because the mean of its divisors is an integer number (2269134).

Almost surely, 2^55797690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55797690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72612288).

55797690 is an abundant number, since it is smaller than the sum of its proper divisors (89426886).

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

55797690 is a wasteful number, since it uses less digits than its factorization.

55797690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its (nonzero) digits is 595350, while the sum is 48.

The square root of 55797690 is about 7469.7851374722. The cubic root of 55797690 is about 382.1249602606.

The spelling of 55797690 in words is "fifty-five million, seven hundred ninety-seven thousand, six hundred ninety".