125780778 has 12 divisors (see below), whose sum is σ = 272525058. Its totient is φ = 41926920.

The previous prime is 125780777. The next prime is 125780783. The reversal of 125780778 is 877087521.

125780778 is a `hidden beast` number, since 1 + 2 + 578 + 0 + 7 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 99740169 + 26040609 = 9987^2 + 5103^2 .

It is a super-2 number, since 2×125780778² = 31641608228570568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125780777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3493893 + ... + 3493928.

Almost surely, 2^125780778 is an apocalyptic number.

125780778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

125780778 is an abundant number, since it is smaller than the sum of its proper divisors (146744280).

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

125780778 is a wasteful number, since it uses less digits than its factorization.

125780778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6987829 (or 6987826 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 45.

The square root of 125780778 is about 11215.2029852339. The cubic root of 125780778 is about 501.0388773063.

The spelling of 125780778 in words is "one hundred twenty-five million, seven hundred eighty thousand, seven hundred seventy-eight".