125499780 has 432 divisors, whose sum is σ = 501935616. Its totient is φ = 26127360.

The previous prime is 125499779. The next prime is 125499793. The reversal of 125499780 is 87994521.

125499780 is a `hidden beast` number, since 12 + 549 + 97 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4048365 + ... + 4048395.

It is an arithmetic number, because the mean of its divisors is an integer number (1161888).

Almost surely, 2^125499780 is an apocalyptic number.

125499780 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 125499780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250967808).

125499780 is an abundant number, since it is smaller than the sum of its proper divisors (376435836).

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

125499780 is a wasteful number, since it uses less digits than its factorization.

125499780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 125499780 is about 11202.6684321192. The cubic root of 125499780 is about 500.6654871940.

The spelling of 125499780 in words is "one hundred twenty-five million, four hundred ninety-nine thousand, seven hundred eighty".