78747494 has 8 divisors (see below), whose sum is σ = 134995728. Its totient is φ = 33748920.

The previous prime is 78747479. The next prime is 78747497. The reversal of 78747494 is 49474787.

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

It is a super-2 number, since 2×78747494² = 12402335622560072, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78747497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2812397 + ... + 2812424.

It is an arithmetic number, because the mean of its divisors is an integer number (16874466).

Almost surely, 2^78747494 is an apocalyptic number.

78747494 is a deficient number, since it is larger than the sum of its proper divisors (56248234).

78747494 is a wasteful number, since it uses less digits than its factorization.

78747494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624830.

The product of its digits is 1580544, while the sum is 50.

The square root of 78747494 is about 8873.9784764219. The cubic root of 78747494 is about 428.6263974044.

The spelling of 78747494 in words is "seventy-eight million, seven hundred forty-seven thousand, four hundred ninety-four".