78038137831 has 4 divisors (see below), whose sum is σ = 78049955872. Its totient is φ = 78026319792.

The previous prime is 78038137823. The next prime is 78038137963. The reversal of 78038137831 is 13873183087.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13873183087 = 1459 ⋅9508693.

It is a cyclic number.

It is not a de Polignac number, because 78038137831 - 2³ = 78038137823 is a prime.

It is a super-2 number, since 2×78038137831² (a number of 23 digits) 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 (78038137031) 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, 5899110 + ... + 5912323.

It is an arithmetic number, because the mean of its divisors is an integer number (19512488968).

Almost surely, 2^78038137831 is an apocalyptic number.

78038137831 is a deficient number, since it is larger than the sum of its proper divisors (11818041).

78038137831 is a wasteful number, since it uses less digits than its factorization.

78038137831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11818040.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 78038137831 in words is "seventy-eight billion, thirty-eight million, one hundred thirty-seven thousand, eight hundred thirty-one".