78401370 has 32 divisors (see below), whose sum is σ = 189329472. Its totient is φ = 20777472.

The previous prime is 78401369. The next prime is 78401371. The reversal of 78401370 is 7310487.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78401369) and next prime (78401371).

It is a super-2 number, since 2×78401370² = 12293549635753800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (78401371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3127 + ... + 12906.

It is an arithmetic number, because the mean of its divisors is an integer number (5916546).

Almost surely, 2^78401370 is an apocalyptic number.

78401370 is an abundant number, since it is smaller than the sum of its proper divisors (110928102).

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

78401370 is a wasteful number, since it uses less digits than its factorization.

78401370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16206.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 78401370 is about 8854.4548109977. The cubic root of 78401370 is about 427.9974852096.

The spelling of 78401370 in words is "seventy-eight million, four hundred one thousand, three hundred seventy".