78880951438 has 4 divisors (see below), whose sum is σ = 118321427160. Its totient is φ = 39440475718.

The previous prime is 78880951427. The next prime is 78880951463. The reversal of 78880951438 is 83415908887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83415908887 = 55579 ⋅1500853.

It is a super-2 number, since 2×78880951438² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19720237858 + ... + 19720237861.

It is an arithmetic number, because the mean of its divisors is an integer number (29580356790).

Almost surely, 2^78880951438 is an apocalyptic number.

78880951438 is a deficient number, since it is larger than the sum of its proper divisors (39440475722).

78880951438 is a wasteful number, since it uses less digits than its factorization.

78880951438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39440475721.

The product of its (nonzero) digits is 15482880, while the sum is 61.

The spelling of 78880951438 in words is "seventy-eight billion, eight hundred eighty million, nine hundred fifty-one thousand, four hundred thirty-eight".