771246540 has 72 divisors (see below), whose sum is σ = 2351801088. Its totient is φ = 204579840.

The previous prime is 771246527. The next prime is 771246577. The reversal of 771246540 is 45642177.

771246540 is a `hidden beast` number, since 7 + 71 + 2 + 46 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 771246495 and 771246504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23164 + ... + 45596.

It is an arithmetic number, because the mean of its divisors is an integer number (32663904).

Almost surely, 2^771246540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 771246540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175900544).

771246540 is an abundant number, since it is smaller than the sum of its proper divisors (1580554548).

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

771246540 is a wasteful number, since it uses less digits than its factorization.

771246540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22639 (or 22634 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 771246540 is about 27771.3258595984. The cubic root of 771246540 is about 917.0599829870.

The spelling of 771246540 in words is "seven hundred seventy-one million, two hundred forty-six thousand, five hundred forty".