78561098 has 16 divisors (see below), whose sum is σ = 146919744. Its totient is φ = 30608160.

The previous prime is 78561089. The next prime is 78561151. The reversal of 78561098 is 89016587.

It is a happy number.

It is a super-2 number, since 2×78561098² = 12343692237931208, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon 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, 254915 + ... + 255222.

It is an arithmetic number, because the mean of its divisors is an integer number (9182484).

Almost surely, 2^78561098 is an apocalyptic number.

78561098 is a deficient number, since it is larger than the sum of its proper divisors (68358646).

78561098 is a wasteful number, since it uses less digits than its factorization.

78561098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510157.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 78561098 is about 8863.4698623056. The cubic root of 78561098 is about 428.2879427577.

The spelling of 78561098 in words is "seventy-eight million, five hundred sixty-one thousand, ninety-eight".