78251478 has 8 divisors (see below), whose sum is σ = 156502968. Its totient is φ = 26083824.

The previous prime is 78251477. The next prime is 78251489. The reversal of 78251478 is 87415287.

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

78251478 is an admirable number.

It is a super-2 number, since 2×78251478² = 12246587618368968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78251473) 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, 6520951 + ... + 6520962.

It is an arithmetic number, because the mean of its divisors is an integer number (19562871).

Almost surely, 2^78251478 is an apocalyptic number.

78251478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78251478 is a wasteful number, since it uses less digits than its factorization.

78251478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13041918.

The product of its digits is 125440, while the sum is 42.

The square root of 78251478 is about 8845.9865475819. The cubic root of 78251478 is about 427.7245549171.

The spelling of 78251478 in words is "seventy-eight million, two hundred fifty-one thousand, four hundred seventy-eight".