620644546 has 4 divisors (see below), whose sum is σ = 930966822. Its totient is φ = 310322272.

The previous prime is 620644523. The next prime is 620644553. The reversal of 620644546 is 645446026.

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., 616280625 + 4363921 = 24825^2 + 2089^2 .

It is a super-2 number, since 2×620644546² = 770399304959092232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155161135 + ... + 155161138.

Almost surely, 2^620644546 is an apocalyptic number.

620644546 is a deficient number, since it is larger than the sum of its proper divisors (310322276).

620644546 is a wasteful number, since it uses less digits than its factorization.

620644546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310322275.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 620644546 is about 24912.7386290628. The cubic root of 620644546 is about 852.9972828727.

The spelling of 620644546 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred forty-six".