78581240 has 16 divisors (see below), whose sum is σ = 176807880. Its totient is φ = 31432480.

The previous prime is 78581233. The next prime is 78581257. The reversal of 78581240 is 4218587.

It is a super-2 number, since 2×78581240² = 12350022559875200, 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 78581240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982226 + ... + 982305.

Almost surely, 2^78581240 is an apocalyptic number.

It is an amenable number.

78581240 is an abundant number, since it is smaller than the sum of its proper divisors (98226640).

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

78581240 is a wasteful number, since it uses less digits than its factorization.

78581240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964542 (or 1964538 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 78581240 is about 8864.6060262146. The cubic root of 78581240 is about 428.3245420365.

The spelling of 78581240 in words is "seventy-eight million, five hundred eighty-one thousand, two hundred forty".