78045640 has 32 divisors (see below), whose sum is σ = 185933880. Its totient is φ = 29381632.

The previous prime is 78045619. The next prime is 78045659. The reversal of 78045640 is 4654087.

It can be written as a sum of positive squares in 4 ways, for example, as 78039556 + 6084 = 8834^2 + 78^2 .

It is a super-2 number, since 2×78045640² = 12182243846019200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 78045596 and 78045605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56707 + ... + 58066.

Almost surely, 2^78045640 is an apocalyptic number.

It is an amenable number.

78045640 is an abundant number, since it is smaller than the sum of its proper divisors (107888240).

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

78045640 is a wasteful number, since it uses less digits than its factorization.

78045640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114801 (or 114797 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 78045640 is about 8834.3443446585. The cubic root of 78045640 is about 427.3491870247.

The spelling of 78045640 in words is "seventy-eight million, forty-five thousand, six hundred forty".