78412530 has 32 divisors (see below), whose sum is σ = 215074944. Its totient is φ = 17922816.

The previous prime is 78412519. The next prime is 78412531. The reversal of 78412530 is 3521487.

It is a super-2 number, since 2×78412530² = 12297049722001800, 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 (78412531) 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, 186487 + ... + 186906.

It is an arithmetic number, because the mean of its divisors is an integer number (6721092).

Almost surely, 2^78412530 is an apocalyptic number.

78412530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78412530 is an abundant number, since it is smaller than the sum of its proper divisors (136662414).

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

78412530 is a wasteful number, since it uses less digits than its factorization.

78412530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373410.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78412530 is about 8855.0849798294. The cubic root of 78412530 is about 428.0177919351.

The spelling of 78412530 in words is "seventy-eight million, four hundred twelve thousand, five hundred thirty".