1978545802 has 8 divisors (see below), whose sum is σ = 2980779300. Its totient is φ = 984952704.

The previous prime is 1978545787. The next prime is 1978545817. The reversal of 1978545802 is 2085458791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1978545787) and next prime (1978545817).

It can be written as a sum of positive squares in 2 ways, for example, as 1857523801 + 121022001 = 43099^2 + 11001^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1978545802² = 7829286981223646408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2159527 + ... + 2160442.

Almost surely, 2^1978545802 is an apocalyptic number.

1978545802 is a deficient number, since it is larger than the sum of its proper divisors (1002233498).

1978545802 is a wasteful number, since it uses less digits than its factorization.

1978545802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320200.

The product of its (nonzero) digits is 806400, while the sum is 49.

The square root of 1978545802 is about 44480.8475863489. The cubic root of 1978545802 is about 1255.3997450419.

The spelling of 1978545802 in words is "one billion, nine hundred seventy-eight million, five hundred forty-five thousand, eight hundred two".