77687050 has 72 divisors (see below), whose sum is σ = 172833804. Its totient is φ = 25885440.

The previous prime is 77687047. The next prime is 77687053. The reversal of 77687050 is 5078677.

It is an interprime number because it is at equal distance from previous prime (77687047) and next prime (77687053).

It can be written as a sum of positive squares in 6 ways, for example, as 63345681 + 14341369 = 7959^2 + 3787^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77686994 and 77687012.

It is not an unprimeable number, because it can be changed into a prime (77687053) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90222 + ... + 91078.

Almost surely, 2^77687050 is an apocalyptic number.

77687050 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77687050 is an abundant number, since it is smaller than the sum of its proper divisors (95146754).

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

77687050 is a wasteful number, since it uses less digits than its factorization.

77687050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 40.

The square root of 77687050 is about 8814.0257544439. The cubic root of 77687050 is about 426.6936797947.

The spelling of 77687050 in words is "seventy-seven million, six hundred eighty-seven thousand, fifty".