77928631 has 4 divisors (see below), whose sum is σ = 85013064. Its totient is φ = 70844200.

The previous prime is 77928619. The next prime is 77928649. The reversal of 77928631 is 13682977.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77928631 - 2⁷ = 77928503 is a prime.

It is a super-2 number, since 2×77928631² = 12145743059068322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77928661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3542200 + ... + 3542221.

It is an arithmetic number, because the mean of its divisors is an integer number (21253266).

Almost surely, 2^77928631 is an apocalyptic number.

77928631 is a deficient number, since it is larger than the sum of its proper divisors (7084433).

77928631 is a wasteful number, since it uses less digits than its factorization.

77928631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084432.

The product of its digits is 127008, while the sum is 43.

The square root of 77928631 is about 8827.7194676768. The cubic root of 77928631 is about 427.1355141404.

The spelling of 77928631 in words is "seventy-seven million, nine hundred twenty-eight thousand, six hundred thirty-one".