78241990 has 16 divisors (see below), whose sum is σ = 149120352. Its totient is φ = 29455744.

The previous prime is 78241963. The next prime is 78242011. The reversal of 78241990 is 9914287.

It is a super-2 number, since 2×78241990² = 12243617998320200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229954 + ... + 230293.

It is an arithmetic number, because the mean of its divisors is an integer number (9320022).

Almost surely, 2^78241990 is an apocalyptic number.

78241990 is a deficient number, since it is larger than the sum of its proper divisors (70878362).

78241990 is a wasteful number, since it uses less digits than its factorization.

78241990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460271.

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

The square root of 78241990 is about 8845.4502429215. The cubic root of 78241990 is about 427.7072670025.

The spelling of 78241990 in words is "seventy-eight million, two hundred forty-one thousand, nine hundred ninety".