771145140 has 24 divisors (see below), whose sum is σ = 2159206560. Its totient is φ = 205638688.

The previous prime is 771145139. The next prime is 771145147. The reversal of 771145140 is 41541177.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 771145098 and 771145107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771145147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6426150 + ... + 6426269.

It is an arithmetic number, because the mean of its divisors is an integer number (89966940).

Almost surely, 2^771145140 is an apocalyptic number.

It is an amenable number.

771145140 is an abundant number, since it is smaller than the sum of its proper divisors (1388061420).

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

771145140 is a wasteful number, since it uses less digits than its factorization.

771145140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852431 (or 12852429 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 771145140 is about 27769.5001755523. The cubic root of 771145140 is about 917.0197909286.

The spelling of 771145140 in words is "seven hundred seventy-one million, one hundred forty-five thousand, one hundred forty".