55782690 has 32 divisors (see below), whose sum is σ = 135578880. Its totient is φ = 14686464.

The previous prime is 55782677. The next prime is 55782691. The reversal of 55782690 is 9628755.

It is a super-2 number, since 2×55782690² = 6223417007272200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55782691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9399 + ... + 14138.

It is an arithmetic number, because the mean of its divisors is an integer number (4236840).

Almost surely, 2^55782690 is an apocalyptic number.

55782690 is an abundant number, since it is smaller than the sum of its proper divisors (79796190).

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

55782690 is a wasteful number, since it uses less digits than its factorization.

55782690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23626.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 55782690 is about 7468.7810250402. The cubic root of 55782690 is about 382.0907151863.

The spelling of 55782690 in words is "fifty-five million, seven hundred eighty-two thousand, six hundred ninety".