77139248 has 20 divisors (see below), whose sum is σ = 152934408. Its totient is φ = 37672320.

The previous prime is 77139241. The next prime is 77139269. The reversal of 77139248 is 84293177.

It is not an unprimeable number, because it can be changed into a prime (77139241) 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, 55373 + ... + 56748.

Almost surely, 2^77139248 is an apocalyptic number.

It is an amenable number.

77139248 is a deficient number, since it is larger than the sum of its proper divisors (75795160).

77139248 is a wasteful number, since it uses less digits than its factorization.

77139248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112172 (or 112166 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 77139248 is about 8782.8951946383. The cubic root of 77139248 is about 425.6883847474.

It can be divided in two parts, 7713 and 9248, that added together give a palindrome (16961).

The spelling of 77139248 in words is "seventy-seven million, one hundred thirty-nine thousand, two hundred forty-eight".