530987978 has 4 divisors (see below), whose sum is σ = 796481970. Its totient is φ = 265493988.

The previous prime is 530987953. The next prime is 530987983. The reversal of 530987978 is 879789035.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879789035 = 5 ⋅175957807.

It can be written as a sum of positive squares in only one way, i.e., 452966089 + 78021889 = 21283^2 + 8833^2 .

It is a super-3 number, since 3×530987978³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132746993 + ... + 132746996.

Almost surely, 2^530987978 is an apocalyptic number.

530987978 is a deficient number, since it is larger than the sum of its proper divisors (265493992).

530987978 is a wasteful number, since it uses less digits than its factorization.

530987978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265493991.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The square root of 530987978 is about 23043.1763869480. The cubic root of 530987978 is about 809.7697755496.

The spelling of 530987978 in words is "five hundred thirty million, nine hundred eighty-seven thousand, nine hundred seventy-eight".