77931434 has 16 divisors (see below), whose sum is σ = 141455808. Its totient is φ = 31434432.

The previous prime is 77931433. The next prime is 77931461. The reversal of 77931434 is 43413977.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77931433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163484 + ... + 163959.

It is an arithmetic number, because the mean of its divisors is an integer number (8840988).

Almost surely, 2^77931434 is an apocalyptic number.

77931434 is a deficient number, since it is larger than the sum of its proper divisors (63524374).

77931434 is a wasteful number, since it uses less digits than its factorization.

77931434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327469.

The product of its digits is 63504, while the sum is 38.

The square root of 77931434 is about 8827.8782275244. The cubic root of 77931434 is about 427.1406352642.

The spelling of 77931434 in words is "seventy-seven million, nine hundred thirty-one thousand, four hundred thirty-four".