1071527778 has 40 divisors (see below), whose sum is σ = 2415454272. Its totient is φ = 355028184.

The previous prime is 1071527777. The next prime is 1071527791. The reversal of 1071527778 is 8777251701.

It is a happy number.

It is a super-2 number, since 2×1071527778² = 2296343558051234568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1071527771) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7251 + ... + 46857.

Almost surely, 2^1071527778 is an apocalyptic number.

1071527778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1071527778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207727136).

1071527778 is an abundant number, since it is smaller than the sum of its proper divisors (1343926494).

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

1071527778 is a wasteful number, since it uses less digits than its factorization.

1071527778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39788 (or 39779 counting only the distinct ones).

The product of its (nonzero) digits is 192080, while the sum is 45.

The square root of 1071527778 is about 32734.1989057316. The cubic root of 1071527778 is about 1023.2956894154.

The spelling of 1071527778 in words is "one billion, seventy-one million, five hundred twenty-seven thousand, seven hundred seventy-eight".