12577780 has 48 divisors (see below), whose sum is σ = 28344960. Its totient is φ = 4675968.

The previous prime is 12577759. The next prime is 12577781. The reversal of 12577780 is 8777521.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12577781) 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, 16651 + ... + 17389.

It is an arithmetic number, because the mean of its divisors is an integer number (590520).

Almost surely, 2^12577780 is an apocalyptic number.

12577780 is a gapful number since it is divisible by the number (10) 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 12577780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14172480).

12577780 is an abundant number, since it is smaller than the sum of its proper divisors (15767180).

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

12577780 is a wasteful number, since it uses less digits than its factorization.

12577780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 806 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 12577780 is about 3546.5166008352. The cubic root of 12577780 is about 232.5598104113.

The spelling of 12577780 in words is "twelve million, five hundred seventy-seven thousand, seven hundred eighty".