761778145 has 16 divisors (see below), whose sum is σ = 930690000. Its totient is φ = 598478848.

The previous prime is 761778137. The next prime is 761778161. The reversal of 761778145 is 541877167.

It can be written as a sum of positive squares in 8 ways, for example, as 243578449 + 518199696 = 15607^2 + 22764^2 .

It is a cyclic number.

It is not a de Polignac number, because 761778145 - 2³ = 761778137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 761778095 and 761778104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60561 + ... + 72049.

It is an arithmetic number, because the mean of its divisors is an integer number (58168125).

Almost surely, 2^761778145 is an apocalyptic number.

It is an amenable number.

761778145 is a deficient number, since it is larger than the sum of its proper divisors (168911855).

761778145 is a wasteful number, since it uses less digits than its factorization.

761778145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11732.

The product of its digits is 329280, while the sum is 46.

The square root of 761778145 is about 27600.3287118107. The cubic root of 761778145 is about 913.2916834891.

The spelling of 761778145 in words is "seven hundred sixty-one million, seven hundred seventy-eight thousand, one hundred forty-five".