77031381 has 24 divisors (see below), whose sum is σ = 120000960. Its totient is φ = 43825152.

The previous prime is 77031359. The next prime is 77031407. The reversal of 77031381 is 18313077.

It is not a de Polignac number, because 77031381 - 2⁹ = 77030869 is a prime.

It is a super-2 number, since 2×77031381² = 11867667317534322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77031341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36760 + ... + 38798.

It is an arithmetic number, because the mean of its divisors is an integer number (5000040).

Almost surely, 2^77031381 is an apocalyptic number.

It is an amenable number.

77031381 is a deficient number, since it is larger than the sum of its proper divisors (42969579).

77031381 is a wasteful number, since it uses less digits than its factorization.

77031381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313 (or 2306 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 77031381 is about 8776.7523036713. The cubic root of 77031381 is about 425.4898729664.

The spelling of 77031381 in words is "seventy-seven million, thirty-one thousand, three hundred eighty-one".