78412990 has 16 divisors (see below), whose sum is σ = 144958752. Its totient is φ = 30517344.

The previous prime is 78412979. The next prime is 78412991. The reversal of 78412990 is 9921487.

It is a super-2 number, since 2×78412990² = 12297194001480200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78412991) 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, 105594 + ... + 106333.

It is an arithmetic number, because the mean of its divisors is an integer number (9059922).

Almost surely, 2^78412990 is an apocalyptic number.

78412990 is a deficient number, since it is larger than the sum of its proper divisors (66545762).

78412990 is a wasteful number, since it uses less digits than its factorization.

78412990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211971.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 78412990 is about 8855.1109535680. The cubic root of 78412990 is about 428.0186289094.

The spelling of 78412990 in words is "seventy-eight million, four hundred twelve thousand, nine hundred ninety".