77161540 has 24 divisors (see below), whose sum is σ = 162207360. Its totient is φ = 30832608.

The previous prime is 77161529. The next prime is 77161543. The reversal of 77161540 is 4516177.

It is not an unprimeable number, because it can be changed into a prime (77161543) 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, 31189 + ... + 33571.

It is an arithmetic number, because the mean of its divisors is an integer number (6758640).

Almost surely, 2^77161540 is an apocalyptic number.

It is an amenable number.

77161540 is an abundant number, since it is smaller than the sum of its proper divisors (85045820).

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

77161540 is a wasteful number, since it uses less digits than its factorization.

77161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011 (or 4009 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 77161540 is about 8784.1641605790. The cubic root of 77161540 is about 425.7293864932.

The spelling of 77161540 in words is "seventy-seven million, one hundred sixty-one thousand, five hundred forty".