274921978 has 4 divisors (see below), whose sum is σ = 412382970. Its totient is φ = 137460988.

The previous prime is 274921973. The next prime is 274921993. The reversal of 274921978 is 879129472.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 194407249 + 80514729 = 13943^2 + 8973^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (274921973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68730493 + ... + 68730496.

Almost surely, 2^274921978 is an apocalyptic number.

274921978 is a deficient number, since it is larger than the sum of its proper divisors (137460992).

274921978 is a wasteful number, since it uses less digits than its factorization.

274921978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137460991.

The product of its digits is 508032, while the sum is 49.

The square root of 274921978 is about 16580.7713330834. The cubic root of 274921978 is about 650.2342177626.

The spelling of 274921978 in words is "two hundred seventy-four million, nine hundred twenty-one thousand, nine hundred seventy-eight".