78461545 has 24 divisors (see below), whose sum is σ = 105256584. Its totient is φ = 55945728.

The previous prime is 78461531. The next prime is 78461557. The reversal of 78461545 is 54516487.

It can be written as a sum of positive squares in 4 ways, for example, as 13868176 + 64593369 = 3724^2 + 8037^2 .

It is not a de Polignac number, because 78461545 - 2⁷ = 78461417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78461498 and 78461507.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29407 + ... + 31963.

It is an arithmetic number, because the mean of its divisors is an integer number (4385691).

Almost surely, 2^78461545 is an apocalyptic number.

It is an amenable number.

78461545 is a deficient number, since it is larger than the sum of its proper divisors (26795039).

78461545 is a wasteful number, since it uses less digits than its factorization.

78461545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617 (or 2598 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

The square root of 78461545 is about 8857.8521662986. The cubic root of 78461545 is about 428.1069567759.

The spelling of 78461545 in words is "seventy-eight million, four hundred sixty-one thousand, five hundred forty-five".