678302981 has 16 divisors (see below), whose sum is σ = 713161200. Its totient is φ = 644474880.

The previous prime is 678302951. The next prime is 678303007. The reversal of 678302981 is 189203876.

It can be written as a sum of positive squares in 8 ways, for example, as 6974881 + 671328100 = 2641^2 + 25910^2 .

It is not a de Polignac number, because 678302981 - 2⁶ = 678302917 is a prime.

It is a super-2 number, since 2×678302981² = 920189868066972722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678302951) 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, 335285 + ... + 337301.

It is an arithmetic number, because the mean of its divisors is an integer number (44572575).

Almost surely, 2^678302981 is an apocalyptic number.

678302981 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

678302981 is a deficient number, since it is larger than the sum of its proper divisors (34858219).

678302981 is a wasteful number, since it uses less digits than its factorization.

678302981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 678302981 is about 26044.2504403563. The cubic root of 678302981 is about 878.6338051052.

The spelling of 678302981 in words is "six hundred seventy-eight million, three hundred two thousand, nine hundred eighty-one".