78278641 has 8 divisors (see below), whose sum is σ = 91365120. Its totient is φ = 65668128.

The previous prime is 78278639. The next prime is 78278647. The reversal of 78278641 is 14687287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78278641 - 2¹ = 78278639 is a prime.

It is a super-2 number, since 2×78278641² = 12255091273613762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78278647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118636 + ... + 119293.

It is an arithmetic number, because the mean of its divisors is an integer number (11420640).

Almost surely, 2^78278641 is an apocalyptic number.

It is an amenable number.

78278641 is a deficient number, since it is larger than the sum of its proper divisors (13086479).

78278641 is a wasteful number, since it uses less digits than its factorization.

78278641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237983.

The product of its digits is 150528, while the sum is 43.

The square root of 78278641 is about 8847.5217434036. The cubic root of 78278641 is about 427.7740404064.

The spelling of 78278641 in words is "seventy-eight million, two hundred seventy-eight thousand, six hundred forty-one".