621400747 has 8 divisors (see below), whose sum is σ = 687178800. Its totient is φ = 557170560.

The previous prime is 621400739. The next prime is 621400763. The reversal of 621400747 is 747004126.

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

It is a cyclic number.

It is not a de Polignac number, because 621400747 - 2³ = 621400739 is a prime.

It is a super-2 number, since 2×621400747² = 772277776744316018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621400147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386122 + ... + 387727.

It is an arithmetic number, because the mean of its divisors is an integer number (85897350).

Almost surely, 2^621400747 is an apocalyptic number.

621400747 is a deficient number, since it is larger than the sum of its proper divisors (65778053).

621400747 is a wasteful number, since it uses less digits than its factorization.

621400747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773933.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 621400747 is about 24927.9110035318. The cubic root of 621400747 is about 853.3435764185.

The spelling of 621400747 in words is "six hundred twenty-one million, four hundred thousand, seven hundred forty-seven".