55497690 has 128 divisors (see below), whose sum is σ = 159563520. Its totient is φ = 13676544.

The previous prime is 55497679. The next prime is 55497691. The reversal of 55497690 is 9679455.

It is a happy number.

55497690 is a `hidden beast` number, since 554 + 9 + 7 + 6 + 90 = 666.

It is a super-2 number, since 2×55497690² = 6159987190672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (55497691) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 491074 + ... + 491186.

It is an arithmetic number, because the mean of its divisors is an integer number (1246590).

Almost surely, 2^55497690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55497690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79781760).

55497690 is an abundant number, since it is smaller than the sum of its proper divisors (104065830).

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

55497690 is a wasteful number, since it uses less digits than its factorization.

55497690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 55497690 is about 7449.6771742137. The cubic root of 55497690 is about 381.4388891108.

The spelling of 55497690 in words is "fifty-five million, four hundred ninety-seven thousand, six hundred ninety".