77690137 has 6 divisors (see below), whose sum is σ = 90374298. Its totient is φ = 66591504.

The previous prime is 77690131. The next prime is 77690143. The reversal of 77690137 is 73109677.

It is an interprime number because it is at equal distance from previous prime (77690131) and next prime (77690143).

It can be written as a sum of positive squares in only one way, i.e., 55890576 + 21799561 = 7476^2 + 4669^2 .

It is not a de Polignac number, because 77690137 - 2¹⁵ = 77657369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77690137.

It is not an unprimeable number, because it can be changed into a prime (77690131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 792708 + ... + 792805.

It is an arithmetic number, because the mean of its divisors is an integer number (15062383).

Almost surely, 2^77690137 is an apocalyptic number.

It is an amenable number.

77690137 is a deficient number, since it is larger than the sum of its proper divisors (12684161).

77690137 is a wasteful number, since it uses less digits than its factorization.

77690137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585527 (or 1585520 counting only the distinct ones).

The product of its (nonzero) digits is 55566, while the sum is 40.

The square root of 77690137 is about 8814.2008713212. The cubic root of 77690137 is about 426.6993314700.

The spelling of 77690137 in words is "seventy-seven million, six hundred ninety thousand, one hundred thirty-seven".