78240144 has 40 divisors (see below), whose sum is σ = 209093760. Its totient is φ = 25180288.

The previous prime is 78240109. The next prime is 78240179. The reversal of 78240144 is 44104287.

It is an interprime number because it is at equal distance from previous prime (78240109) and next prime (78240179).

It is a super-2 number, since 2×78240144² = 12243040266281472, which contains 22 as substring.

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, 26712 + ... + 29495.

It is an arithmetic number, because the mean of its divisors is an integer number (5227344).

Almost surely, 2^78240144 is an apocalyptic number.

It is an amenable number.

78240144 is an abundant number, since it is smaller than the sum of its proper divisors (130853616).

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

78240144 is a wasteful number, since it uses less digits than its factorization.

78240144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56247 (or 56241 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 78240144 is about 8845.3458948760. The cubic root of 78240144 is about 427.7039032766.

The spelling of 78240144 in words is "seventy-eight million, two hundred forty thousand, one hundred forty-four".