77470831 has 4 divisors (see below), whose sum is σ = 80839152. Its totient is φ = 74102512.

The previous prime is 77470817. The next prime is 77470837. The reversal of 77470831 is 13807477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13807477 = 347 ⋅39791.

It is a cyclic number.

It is not a de Polignac number, because 77470831 - 2⁹ = 77470319 is a prime.

It is a super-2 number, since 2×77470831² = 12003459311661122, 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 (77470837) 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, 1684126 + ... + 1684171.

It is an arithmetic number, because the mean of its divisors is an integer number (20209788).

Almost surely, 2^77470831 is an apocalyptic number.

77470831 is a deficient number, since it is larger than the sum of its proper divisors (3368321).

77470831 is a wasteful number, since it uses less digits than its factorization.

77470831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368320.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 77470831 is about 8801.7515870422. The cubic root of 77470831 is about 426.2974532871.

The spelling of 77470831 in words is "seventy-seven million, four hundred seventy thousand, eight hundred thirty-one".