57780000 has 240 divisors, whose sum is σ = 212556960. Its totient is φ = 15264000.

The previous prime is 57779987. The next prime is 57780031. The reversal of 57780000 is 8775.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 539947 + ... + 540053.

It is an arithmetic number, because the mean of its divisors is an integer number (885654).

Almost surely, 2^57780000 is an apocalyptic number.

57780000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57780000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106278480).

57780000 is an abundant number, since it is smaller than the sum of its proper divisors (154776960).

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

57780000 is a wasteful number, since it uses less digits than its factorization.

57780000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 57780000 is about 7601.3156755920. The cubic root of 57780000 is about 386.5976227626.

Adding to 57780000 its reverse (8775), we get a palindrome (57788775).

The spelling of 57780000 in words is "fifty-seven million, seven hundred eighty thousand".