77871490 has 8 divisors (see below), whose sum is σ = 140168700. Its totient is φ = 31148592.

The previous prime is 77871439. The next prime is 77871499. The reversal of 77871490 is 9417877.

It can be written as a sum of positive squares in 2 ways, for example, as 72097081 + 5774409 = 8491^2 + 2403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (77871499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3893565 + ... + 3893584.

Almost surely, 2^77871490 is an apocalyptic number.

77871490 is a deficient number, since it is larger than the sum of its proper divisors (62297210).

77871490 is a wasteful number, since it uses less digits than its factorization.

77871490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787156.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 77871490 is about 8824.4824210828. The cubic root of 77871490 is about 427.0310898829.

The spelling of 77871490 in words is "seventy-seven million, eight hundred seventy-one thousand, four hundred ninety".