78463930 has 16 divisors (see below), whose sum is σ = 141569064. Its totient is φ = 31311360.

The previous prime is 78463919. The next prime is 78463933. The reversal of 78463930 is 3936487.

It can be written as a sum of positive squares in 4 ways, for example, as 40972801 + 37491129 = 6401^2 + 6123^2 .

It is a super-2 number, since 2×78463930² = 12313176622089800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78463933) 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, 4731 + ... + 13390.

Almost surely, 2^78463930 is an apocalyptic number.

78463930 is a deficient number, since it is larger than the sum of its proper divisors (63105134).

78463930 is a wasteful number, since it uses less digits than its factorization.

78463930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18561.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 78463930 is about 8857.9867915910. The cubic root of 78463930 is about 428.1112944624. Note that the first 3 decimals are identical.

The spelling of 78463930 in words is "seventy-eight million, four hundred sixty-three thousand, nine hundred thirty".