78454540 has 48 divisors (see below), whose sum is σ = 169301664. Its totient is φ = 30528000.

The previous prime is 78454531. The next prime is 78454547. The reversal of 78454540 is 4545487.

It is a super-2 number, since 2×78454540² = 12310229693223200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78454540.

It is not an unprimeable number, because it can be changed into a prime (78454547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130240 + ... + 130840.

It is an arithmetic number, because the mean of its divisors is an integer number (3527118).

Almost surely, 2^78454540 is an apocalyptic number.

It is an amenable number.

78454540 is an abundant number, since it is smaller than the sum of its proper divisors (90847124).

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

78454540 is a wasteful number, since it uses less digits than its factorization.

78454540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 37.

The square root of 78454540 is about 8857.4567455901. The cubic root of 78454540 is about 428.0942160187.

The spelling of 78454540 in words is "seventy-eight million, four hundred fifty-four thousand, five hundred forty".