78152540 has 48 divisors (see below), whose sum is σ = 170118144. Its totient is φ = 30139200.

The previous prime is 78152539. The next prime is 78152561. The reversal of 78152540 is 4525187.

It is a super-2 number, since 2×78152540² = 12215639016903200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78152497 and 78152506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66155 + ... + 67325.

It is an arithmetic number, because the mean of its divisors is an integer number (3544128).

Almost surely, 2^78152540 is an apocalyptic number.

It is an amenable number.

78152540 is an abundant number, since it is smaller than the sum of its proper divisors (91965604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78152540 is a wasteful number, since it uses less digits than its factorization.

78152540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 78152540 is about 8840.3925252219. The cubic root of 78152540 is about 427.5442130212.

The spelling of 78152540 in words is "seventy-eight million, one hundred fifty-two thousand, five hundred forty".