7771400540 has 48 divisors (see below), whose sum is σ = 17578874880. Its totient is φ = 2877483840.

The previous prime is 7771400537. The next prime is 7771400543. The reversal of 7771400540 is 450041777.

It is an interprime number because it is at equal distance from previous prime (7771400537) and next prime (7771400543).

It is a super-2 number, since 2×7771400540² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7771400540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7771400543) 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, 258230 + ... + 286749.

It is an arithmetic number, because the mean of its divisors is an integer number (366226560).

Almost surely, 2^7771400540 is an apocalyptic number.

It is an amenable number.

7771400540 is an abundant number, since it is smaller than the sum of its proper divisors (9807474340).

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

7771400540 is a wasteful number, since it uses less digits than its factorization.

7771400540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545042 (or 545040 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 35.

The square root of 7771400540 is about 88155.5474147827. The cubic root of 7771400540 is about 1980.7656580393.

The spelling of 7771400540 in words is "seven billion, seven hundred seventy-one million, four hundred thousand, five hundred forty".