7578278081 has 16 divisors (see below), whose sum is σ = 8447763456. Its totient is φ = 6740370000.

The previous prime is 7578278077. The next prime is 7578278129. The reversal of 7578278081 is 1808728757.

It is a cyclic number.

It is not a de Polignac number, because 7578278081 - 2² = 7578278077 is a prime.

It is a super-2 number, since 2×7578278081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7578278881) 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, 65276 + ... + 139346.

It is an arithmetic number, because the mean of its divisors is an integer number (527985216).

Almost surely, 2^7578278081 is an apocalyptic number.

7578278081 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7578278081 is a deficient number, since it is larger than the sum of its proper divisors (869485375).

7578278081 is a wasteful number, since it uses less digits than its factorization.

7578278081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74284.

The product of its (nonzero) digits is 1756160, while the sum is 53.

The square root of 7578278081 is about 87053.3059739835. The cubic root of 7578278081 is about 1964.2202277818.

The spelling of 7578278081 in words is "seven billion, five hundred seventy-eight million, two hundred seventy-eight thousand, eighty-one".